Ron Gilbert's only game with Double Fine, The Cave, is bound for iOS devices this summer. Touchgen have had some hands-on time with port being handled by SEGA and say the touch-screen controls work pretty well. Pointing on the screen to move your character seems like a much more appropriate solution to movement rather than using virtual buttons or joysticks.
I'd be interested to see how the platforming is handled on the iOS version as that's something Conrad raised in his review as a problem with the original console and PC versions. Still, the game's real strength is in the writing and the puzzles and I'm sure that will still shine through.