wurenben: Only one playable race : The important feature of Homm/AoW series is multiple races. And in domions 3 , you got millions of choices with Race-God-Magic-Dominion combination, that greatly increases replay value. So I hope there are more races to select in this game.
You hope wrong, and apparently you've not understood how the Eador games are designed. Yes you get a single castle and "race", but it has an incalculable number of buildings, and it forces you to make excruciatingly important strategic choices as you develop it, because you cannot build everything.
This gives the games great replayability, because everytime you attack a new shard you'll want to try a different building set, a new hero, or even a new way to play the same one. I've played a lot of the games you mention, and in most cases their apparent variety is mostly separate sets of linear upgrades. Here the depth is much more satisfying.
These games have multiple races btw, but you ally with them and get a few units/buildings as a result, instead of having a menagerie of themed castles.
Oh and regarding the technical quality, this game is unfortunately a steaming pile of crap. For the moment Eador Genesis is infinitely more playable, and it doesn't make you want to rip your eyes off because of interface bugs.