via engadget mobile: At a quick glance, you might think that you're looking at the back of a 5530 here, but look closer -- the camera's a little different, and we don't know what's up with that grille or the slits underneath. Indeed, we could very well be looking at the back of a rumored 5900 XpressMusic, a phone allegedly set to bow at Nokia World in Stuttgart next month with a 5 megapixel camera, S60 5th Edition FP1 (first we've heard of an S60 5th Edition feature pack), and -- get this -- support for SDXC, which would give the phone truly insane expandability options.

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