Seems that the game got released, but for some reason I get only a black screen on the homepage:
http://might-and-magic.ubi.com/heroes-6/en-GB/home/

Maybe something is wrong with my firefox, dunno.

Anyways, there are some fresh reviews, mostly saying this (quote) "for many this game will never surpass you-know-which installment of the series, but nevertheless you should give the new Heroes a chance":
http://www.metacritic.com/game/pc/might-magic-heroes-vi