One small thing strikes me - if someones after a 12" iBook, the chances are they want something small and highly portable (assuming that it's not just a really tight budget)
If the rumours are correct, the new iBook is gonna be widescreen and therefore perhaps (i would hope) bigger, and slightly less slip-in-a-bag-able, if you know what I mean. I'm personally going for a current model 12" for that exact reason. I got a 17" widescreen PC laptop which is so huge and heavy, it's sooooo unpractical on the road. The 12" iBook appeals as a super-dooper PDA if you will. I know what it does, and that just fine for a tiny personal computer