As I mentioned earlier, I would've preferred seeing a 12-inch "pro" machine but the 13-inch MacBook doesn't sound bad. It's a bit heavy (over 2 kilograms) and has an integrated graphics card, but those are not necessarily showstoppers for me.

AppleInsider has some close-up shots as well.

Tempting...

Update:
Here's a photo of the size difference between the 12-inch Powerbook and the 13-inch MacBook...