Mutant: Year Zero, yes. Mutant: Heirs of the Apocalypse is not Mutant: Year Zero. Although they somewhat share the same universe (same geographical region, same backstory but takes place 70 years before HoTA) but everything that made M:UA (Heirs of the...) what it is, is non-existant in Year Zero. Besides, FunCom couldn't make a good game to save their lives (TSW had an amazing atmosphere and ambience, great NPCs and quests but the rest was terrible and that was, imo, their best game)...
from what i've seen so far from the game it looks amazing. check out the gameplay demo. but i agree its a miracle funcom didn't go belly up a decade ago.