AoW looks very promising ; nice storyline, great editor, complex diplomacy (with player/races), interesting combat system and an overall Tolkien feeling, which is of course very good.
And AoW takes the elements of Warlords or HOMM3, and enhance them, so I think it will be the next fantasy TBS to buy (but I will waiting for the reviews and the gamers feedback before I'll buy anything, got a lot of bad surprises with games this year

)
Disciples seems to be a good game, but maybe too much simplistic (comparing to AoW).