The above mockup was spotted in China and seems to match closely what we have been hearing about the iPad 2. It has a slimmer profile, an almost entirely flat back, larger speaker, and rear- and front-facing cameras. The model number is one for the original Apple TV while the FCC ID is for a WiFi-only iPad, but those could be placeholders since this is a mockup and not a real working tablet.
It looks like the SIM card slot has been repositioned to a slot that was once expected to house an SD card reader. There is also the 3G antenna and the sloped power button and headphone jack.