While I like the current design very much (still love my 15" pb) I think it's time for a change. The aluminium design has been around for over 4 years, the 12" and 17" pbs were introduced in january 03 if I remember correctly.
For new mac users who don't know the platform and its design for a long time this isn't an issue of course. But whenever I buy my next notebook I'd like it to look & feel different than my now 2 1/2 years old machine. I've owned a rev. A 12" pb and replaced it with my current 15" one because after 2 years with the 12 incher the screen was too small for me. I just don't want to get another aluminium 'book.
And no I don't want a macbook, it's 1. too small for my work (gfx design) and 2. I need the gfx card (some cinema 4D & some gaming).