Geoff Crammond is also reportedly working on Stunt Car Racer 2 for the PC. I saw some press release from a software company about it ages ago. It was reported in these forums, too.
Incidentally, that mobile version of super monkey ball looks interesting. Super Monkey Ball (and Super Monkey Ball 2) are probably my current favourite Gamecube games (they are the killer app that made me buy one, tbh).
