Another patent
There was a patent from Apple somewhat similar to this YEARS ago--with a the full wrist rest being a trackpad, but the center area being functionally different from the rest.
I don't have a link but I did turn up this image which I've had on my hard disk since 2001 (thank you Spotlight!). Anyone have a link to the rumor report it came from? (I'm thinking it was on powerpage.org or one of its past offshoots).
Anyway, remember that MANY Apple patents (like the one I've shown here) don't make it into shipping products. Cool ideas, but don't assume something's coming. And if MacBooks ARE in for some future changes, Merom this fall sounds like the earliest chance.
(Now, in a general sense, Apple does seem to be increasingly serious about touch-based computing, considering recent job openings.)