I've seen a lot of chat about the software announced or rumored to be on the iphone, but very little on the styling and design. One thing that piques my curiosity is the black (plastic) panel at the base of the phone. Is it purely for the antennas for gsm/wifi? Or is there another purpose? I mean has apple stated categorically that the battery is fixed, like the ipod? I don't remember the battery other than it's lifespan ever being mentioned in the Jobs keynote. I also thought it was a likely location for the sim card, but then images and keynote also refer to a tray at the top of the phone for a sim. Not to mention it's quite a large panel if it were just for a sim card. Couple this with the fact that the ipod and apple's designs in general like whole surfaces to be made of one material. This brushed aluminium/black plastic combo is so very unlike them, i feel there's gotta be something more to it. Removable battery, great, memory expansion, awesome. Here's a photo, does anyone have a hi-res image of the back, so we can look for friction ridges, to see if it's removable? Cheers M.