Agree - I think Hearthstone could be one to keep an eye on - it's their first foray into the tablet/mobile game space after decades of experience with PC games. I'm finding it very interesting to see the game roll out first on the PC platform with something which feels like it will drop into droid and iOS tablets without any major layout/interaction changes. There will apparently be a mobile version after this which I can only assume will have some interesting new patterns.