I take no credit for this guide, it was posted by konfeta on the relicnews.com forums.

I became frustrated at the lack of information on the reward tokens you redeem in the campaigns. Sadly this guide only has 5 races complete and I dont know if anyones interested in adding the last one? Please feel free to leave a message and I'll update or make your own version as (Im such an idiot, there are no gift tokens in the Tyranid campaign) This is verbatim from the OP, I only hope to save some time for some poor chap :)

Everything below here is word for word konfetas guide apart from a few extra bits of info kindly given by our community.


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Gear Token redeeming results (Fin: Chaos, Orks, Guard, Eldar)

***Edit***
Update, I was so caught up in the save file back up method I forgot that simply Alt-F4 bypasses the automatic save on exit. So you can use the gift token, check out item stats, and Alt-F4 out of the game. You will rollback to your previous save. Which means I can do this on my own now, but I am playing 1 campaign at a time, so if anyone else still wants to chime in to set this little list up faster, please do.

Heavy Scrap
Warboss - Level 4 Power Klaw; 108 damage, 20% chance to deal 29 bonus damage | Usable by Warboss
Mekboy - Level 3 Beamy Deffgun; 277 damage, +30 damage to vehicles | Usable by Mekboy
Kommando - Level 4 Big Shoota; 8.8 damage, suppresses, +40 HP | Usable by Kommando, Mekboy
Stormboy - Level 3 Big Choppa; 160 Damage, +45 HP | Usable by Stormboy, Waboss

Fancy Scrap
Kaptin - Level 7 Huge Choppa; 238 damage, returns a portion of damage dealt as Health | Usable by Warboss, Stormboy
Mekboy - Level 7 Deff Gun: 36.1 damage, +2 damage to vehicles, hightened proximity damage effect | Usable by Mekboy
Kommando - Level 6 Burna; 30 damage, grants a damage fire aura | Not usable by Warboss
Stormboy - Level 7 Choppa; 91 damage, poisons target on hit | Not usable by Warboss

Shiny Scrap
Kaptin: Level 10 Huge Hammer; 236 damage, 40 damage to enemies in area | Usable by Warboss, Stormboy (it deals terrible, terrible damage)
Mekboy: Level 9 Rokkit Launcha: 86 damage, chance on hit to disable vehicles and stun infantry | Usable by Mekboy, Kommando
Kommando: Level 9 Speshul Shoota: 73 damage, increases rate of fire and speed on kill | Usable by Kommando
Stormboy: Level 10 Huge Hammer: 247 damage, stuns infantry on first hit for long time | Usable by Warboss, Stormboy

First Gift of the Dark Gods
Eliphas - Level 4 Power Sword; 80 damage, +75 HP | Not Usable by Sorc
Sorcerer - Level 3 Staff; 72 damage, +75 HP | Usable by Sorc
Plaguedude - Level 4 Plaguespewer; 19 damage, +75 HP | Usable by Plaguedude
Kain - Level 3 Heavy Bolter; 12.6 Damage, +75 HP | Usable by Kain

Second Gift of the Dark Gods
Eliphas - Level 6 Lightning Claws; 34 damage, Causes a Bleed on Targets | Usable by Eliphas
Sorcerer - Level 6 Forcesword; 83 damage, Doomblast has no cooldown | Usable by Sorc
Plaguedude - Level 7 Rocket Launcher; 331 damage, +50/25 HP/Energy, Restores HP/Energy on every vehicle hit | Usable by Kain, Plaguedude
Kain - Level 7 Plasma Gun; 159 Damage, Chance to do high damage and teleport target on hit | Usable by Kain

Final Gift of the Dark Gods
Eliphas - Level 8 Maul; 127 Damage, +200 Health, +15 Health Regeneration, +35 Armor | Usable by Eliphas
Sorcerer - Level 8 Staff; 100 damage, Replaces regular attack with Let the Galaxy Burn type Fireball| Usable by Sorc
Plaguedude - Level 8 Power Fist; 163 damage, Initial Attack Stuns in an Area | Usable by Plaguedude
Kain - Level 8 Lascannon; 333 Damage, 100% of the damage dealt leached as health | Usable by Kain

First Gift of the Artificer
Lord General - Level 3 Melta Gun; Increased Firing Rate | Usable by LG, Merrick
Merrick - Level 3 Lascannon, +25 Energy | Usable by Merrick
Inquisitor - Level 3 Force Weapon; 43 damage, +75 Energy | Usable by Inquisitor
Commissar - Level 4 Power Fist; 48 damage, +45 Health | Usable by Commissar

Second Gift of the Artificer
Lord General - Level 7 Plasma Gun; 219 damage, +29% accuracy, +13% ranged damage resistance | Usable by Lord General, Merrick
Inquisitor - Level 7 Force Weapon; 65 damage, +50 energy & health, +20 damage to Eldar, Orks and Tyranids | Usable by Inquisitor
Sarge - Level 5 Heavy Bolter; 14.7 damage, no setup, no teardown, even more bonus damage at close range | Usable by Merrick
Commie - Level 6 Power Sword; 95 damage, chance on hit: double damage - chance increases the lower the target's health is | Usable by Commissar, Inquisitor

Final Gift of the Artificer
Lord General - Level 9 Flamer; 32 damage, increased AoE, reduces enemy armor on hit, 50% flame resistance | Usable by General, Sarge
Inquisitor - Level 10 Force Weapon; 85 damage, +75 energy, +20% speed, +17% melee & ranged damage | Usable by Inquisitor
Sarge - Level 10 Autocannon, 11.7 damage; Chance on hit: call in artillery strike, chance on hit: disable vehicle, chance on hit: stun infantry | Usable by Sarge
Commissar - Level 9 Power Fist; 79 damage, on first hit: stun vehicle, chance on hit: massive knockback and damage to infantry | Usable by Comissar

First Gift of the Artificer
Diomedes - Hell's Teeth Level 3 Chainsword 80 dmg,
8% melee dmg resistance Usable by Diomedes and the Ancient
(!Big thanks to Crangus Sugnarc in the comments below for this addition!)

Martellus - Level 4 Flamer; 19 dmg, +17% Movement Speed | Usable by all
Ancient - Level 4 Magnacore Plasma Gun; 161 dmg +15 Damage to Vehicles | Not usable by Cyrus
Cyrus - Level 4 Shotgun; 30 damage, +16% Movement Speed | Usable by Cyrus

Second Gift of the Artificer
Diomedes - Level 5 Thunderhammer; 130 damage, chance to disable vehicles on hit, +25 damage to vehicles | Usable by Diomedes
Martellus - Level 7 Meltagun; 136 damage, +30 damage to vehicles | Not usable by Cyrus
Ancient - Level 6 Bolter; 52 damage, chance to confuse target on hit, +50 health | Usable by all
Cyrus - Xenos Pyre Level 7 Flamer; 25 dmg, Reduces Armor on Hit, provides 25% Flame Damage resist aura | Usable by all (edit: no lvl req)

(Super props to TheEndlessGrey in comments below for extra stats on Magnacore and Xenos Pyre)

Final Gift of the Artificer
Diomedes - Level 10 Lightning Claw; 50 damage, +26% Movement Speed, 26% chance to do 50 bonus damage | Usable by Diomedes, Ancient
Martellus - Level 9 Plasma Gun; 255 damage, chance to heavily damage and disable vehicles on hit | Not usable by Cyrus
Ancient - Level 8 Heavy Bolter; 20.3 dmg, No Tear Down or Set Up, +25% Movement Speed, grants speed boost near death | Usable by Diomedes, Ancient (edit: no lvl req)
Cyrus - Level 10 Sniper Rifle; 2.7 damage, deals massive delayed damage after hit which turns killed enemies into grenades

First Gift of the Ancients
Autarch - Level 3 Fusion Gun; 26.6 dmg, +40 health | Usable by Autarch
Ranger - Level 3 Long Rifle; 98 damage, +40 health | Usable by Ranger
Warlock - Level 3 Singing Spear; 55 damage, 30% knockback chance | Usable by Warlock, Farseer
Farseer - Level 4 Staff; 20 damage, +1.0 energy regen | Usable by Farseer, Warlock

Second Gift of the Ancients
Autarch - Level 6 Executioner; 96 damage, knocks back enemies around target on hit | Usable by Autarch
Ranger - Level 7 Shuriken Catapult; 13.7 damage, +50 energy, +1.0 energy regeneration | Usable by Autarch, Ranger
Warlock - Level 6 Staff; 25 damage, +50 energy aura | Usable by Warlock, Faraseer [No idea why you would ever use this over the Farseer's gift; same ranged damage]
Farseer - Level 7 Singing Spear; 82 damage, Chance to disable vehicle on hit, +5.0 energy regeneration aura | Usable by Warlock, Farseer

Final Gift of the Ancients
Autarch - Level 9 Power Sword, 121 Damage, evasion bonus vs. ranged, increases combat leap range, +25% speed | Usable by Autarch
Ranger - Level 8 Long Rifle, 90 Damage, fires in bursts of 3, longer reload | Usable by Ranger
Warlock - Level 10 Witchblade, 109 Damage, Chance on hit: banish chaos units into warp - deals massive damage, attacks return portion of damage as health, +20 damage vs Chaos Marines | Usable by Farseer, Warlock
Farseer - Level 10 Witchblade, 102 Damage, 99% knockback resistance, +99 health, +99 Armor | Usable by Farseer, Warlock

This is a conclusion, it is concluded.
Props to konfeta for putting this together over at relicnews forums