Additionally to compatibility updates this patch includes some changes to Dreadnought hero upgrades:

Construct Self Destruction Drone on level 9 is replaced by Lava Walking
Greater Fire Bomb (Technologist) on level 9 is replaced by Construct Self Destruction Drone
Reinforced (Ironclad Baron) on level 1 is replaced by Inflict Immolation
Inflict Immolation (Ironclad Baron) on level 3 is replaced by Physical Protection (4 upgrade points)
Physical Protection (Ironclad Baron ) on level 7 is replaced by Dampening Field
Dampening Field (Ironclad Baron) on level 9 is replaced by Rapid Fire (7 upgrade points, gives only +5 additional damage instead of +10)
Rapid Fire (Ironclad Baron) on level 11 is replaced by Inject Mana Fuel