Black or white?
There are pros and cons to having either a black or a white iPhone. First of all, a black iPhone does help to make the screen look bigger and blends in with the screen, or the black letterboxing found on some movies. Of course you could just double click to get rid of that. Unfortunately black also shows the most scratches and fingerprints, as I found out after buying a black iPod back in the day and owning a black iPhone now. Although the iPhone shows far fewer scratches than the iPod did (improvements in scratch resistance?)
White on the other hand, shows very few scratches, as my 7-year-old iBook G4 looks relatively new. That is until you open the lid and see the stains on the area around the trackpad. I've tried everything to get them out. I just hope Apple is using a glossier white plastic on the new iPhone, as their matte finish white stains easily. I think this is why they changed the interior white plastic on the new MacBooks to the same finish as the outside of the shell.
Anyway, if Apple does come out with a new white iPhone, they should keep the front black and make just the back white. That's what most people will see anyway. I might buy a white one and put a glossy red sticker on the back, so it looks like the flag of Japan. がんばれ日本!