I reeeealy like the display in:
, though I can't say I like the idea of a computer that could jump up and scurry across the room.
Being more realistic, I think it's clear that Apple's "new colors" are white, clear, and QuickSilver. (Look at the new Airport Base Station. QuickSilver Apple, and it looks like the base color might be more white, but it's hard to tell.)
Which means that, in all likelihood, there won't be a radical departure in case style. It still bothers me that QuickSilver is a very "interim-looking" case, what with the horrid appearance of the zip drive. And the fact that the base form factor has been the same for over two years, albeit going through three colors. It's a nice, functional case, but sometimes I like Apple to be a little bit crazy.