I think it will work; Nival probably just tweaked one or two branches. For example, look at the skill wheel and the requirements for the Resistance ability in the Defense branch for the Warlock.
I don't understand something. Instead of the proposed 4 slots, only 2 are offered again, just like in Heroes 3???? (I don't have the ability to download the new patch, so I'm asking such a naive question.)
I hope I'm wrong.