The macbooks are essentially the same as before from a design perspective. If you're itching to get one, go ahead and do so because they're great machines. You'd better hurry too; I suspect that by Christmas, they'll be harder to come by.
I just got one of the new macbooks today. I had the 2.16 ghz one but returned it after reading about the fact they were commig out with a new one on here. I was almost obsessing about it. Well anyways they look pretty much the same. The keys are a bit thinner it seems but that might just be me. You can really see the improved graphics though .. looks nice.