The new Saints Row IV "Game of the Year" release – similar to Saints Row: The Third - The Full Package - has a few different names depending on the region and platform (National Treasure Edition, Game of the Century Edition, or Les Bijoux de la Famille.)
http://store.steampowered.com/app/314580/

Despite having different names, they are essentially the same thing. All versions of this release include all previously released DLC for the platform in question.

In addition, there is a bonus weapon costume for the 'Merica gun called the Grass Roots 'Merica for boxed retail versions. Console players will be excited to know that the Xbox 360 and PS3 boxed retail versions also include the limited edition Child's Play charity DLC that was previously only available on PC.

The Steam version includes the same Child’s Play charity DLC as well as the Grass Roots ‘Merica weapon costume. If you have purchased a European PC boxed version of the Game of the Century Edition, the game and all DLC will be in your Library under “Saints Row IV Game of the Century Edition.”

All versions are out now!

RELEASE DATES AND NAMES:

North America:
PS3 and Xbox 360 boxed retail: National Treasure Edition
PSN: National Treasure Edition
Steam: Game of the Century Edition

Europe:
PS3, Xbox 360, and PC boxed retail: Game of the Century Edition
PSN: Game of the Century Edition
Steam: Game of the Century Edition

NOTE: In the UK, the PC version is only available digitally.

France:
PS3, Xbox 360, and PC boxed retail: Les Bijoux de la Famille
PSN: Les Bijoux de la Famille
Steam: Les Bijoux de la Famille

*NOTE: The PC version name changes to "Saints Row IV Game of the Century Edition" on Steam when activated

ACTIVATING DLC:
The DLC automatically activates in the game once you have successfully completed the story mission named The Real World/The Escape where you first exit the Simulation. (Around 1-2 hours into the game.)

The "How The Saints Save Christmas" mission DLC becomes available a little later, after you unlock the Telekinesis power.

DLC LIST:

MISSION DLC:
Enter the Dominatrix
How the Saints Save Christmas

CUSTOMIZATION AND WEAPON DLC:
Grass Roots 'Merica weapon costume *NEW!
Anime pack
Bling Bling pack
Brady Games pack
Child's Play pack
College Daze pack
Commander-in-Chief pack
Dubstep Remix pack
Element of Destruction pack
Game On pack
Gamestop Weapon Contest pack
GAT V pack
Grass Roots pack
Hey Ash Whatcha Playin? pack
Pirate's Booty pack
Presidential pack
Reverse Cosplay pack
Stone Age pack
Thank You pack
The Executive Privilege pack
The Rectifier
The Super Saints pack
Volition Comics pack
Wild West pack
Zinyak Attack pack

*NOTE: The TF2 Preorder DLC was a special promotion only, and is not available for purchase or with the Game of the Century Edition