The screws and seams might go, but yeah, I think the final shipping product will look for the most part like that. Why would they put time and money into designing an extremely nice looking prototype case and then throw it away and replace it with something different?
Have you guys ever seen an iPhone 3GS? it has visible screws in the same location.
And I'm sticking to this being super sexy. I hate the current design, it's horrible. It just looks like a curvy candy bar or something. This new design coupled with a high res screen is pure sex.
P.S. Letter from Apple requesting their phone back AKA its real:
http://gizmodo.com/5520479/a-letter-apple-wants-its-secret-iphone-back