Not a whole lot is known about the HTC Supersonic, but many are speculating it will be the first Android phone to support Sprint’s 4G WiMax network. Sprint will be launching a 4G handset by summer so we could learn more at this month’s upcoming CTIA show. The rumors claim the Supersonic could feature a 4.3 inch AMOLED display, 1 GHz Snapdragon processor, 1 GB ROM, and Android 2.1 with the new Sense UI.
A few of these phones are already in the wild and some guy uploaded a video to YouTube. We don’t get to see anything really except for the back of the phone which clearly states HTC Supersonic (ok it’s blurry, but you can read it).
These leaks have a history of getting pulled so here is a screen grab just in case.

Back of the HTC Supersonic.
