Here's the first scuttle on the forthcoming iPhone 2.0 on Engadget. It's not much at this point, but it's better than nothing. Most of the improvements seem like things that were left out of the original, which isn't a bad thing- the biggest difference seems to be the glossy plastic shell that will replace the aluminum one. Looks pretty good to me.
My one wish for Apple though is to include a digi-zoom for the camera (and a higher mp count wouldn't hurt either).