I think it looks really cool but there aren't enough races. They have Empire, Orcs, Dwarves and Chaos is locked behind a pre-order. In an interview they said they are making three standalone Warhammer Total War games, each with new campaigns and races, so it's going to end up being very expensive if they're charging £49.99 for each game. It's just like how they love to milk culture packs out of the recent Total War games.
I'll maybe pick it up when it's really cheap, depending on what races are available.