But what about that superpowerfull skill every race has (like the arcane skill of the mages that let's them cast every spell at expert level), I mean if it's ever being built on the HOMMKingdoms it would be a disadvantage towards the newcomes since the old ones had time teaching their heroes this skill. How cauld U think this skill would be in the Game? Or not, why not?

HOMM Kingdoms will only be loosely based on HOMM mechanics. I don't think you will have to worry (at this stage) about a very specific mechanic that I assume was introduced into HOMM 5.