I'm soooo getting an iPad for this game. Ok, maybe not solely for Carcassonne, but it's definitely a BIG reason for me. I really, really, really like the iPhone version, but a bigger screen in combo with hot-seat mulyiplayer, that's just pure sex right there.
Not sure on when to get the iPad though, can't really afford such a big purchase right now (student), but if i do have the money in 2-3 months... I'm afraid I'm going to regret it when the iPad Deux hits sometime spring '11 probably.
The Carcassonne iPad update could draw me in I think...
Edit: Anyone ever played the hot-seat multiplayer option on the iPhone btw? How do your friends/family like it?!