The Cupcake update added a lot to the HTC G1, but coming along with its announcement, T-Mobile also mentioned a new Android handset.  What could this handset be?  Well, some leaked documents indicate that it’s the T-Mobile G1 Bigfoot.  It’s basically an updated version of the G1.  The Bigfoot will be more than just software updates, too—the device will be more rounded and be slimmer than the G1 that’s currently available.  It will still have the sliding keyboard, although with Cupcake, we assume the touchscreen keyboard will be there, too.  What else will be new?  We’re not sure yet, but we know we don’t have that long to wait—Bigfoot is scheduled for a fall launch in the US.