iPad 2 cases show up, a rear-facing camera, an SD card slot likely
Certain mystery cases have been revealed in China that bear resemblance to the iPad 2. AppleInsider and MIC Gadget have gained access to iPad 2 shells that display nearly identical cut-outs. These shells have displayed a rear-facing camera, an SD card slot, and perhaps even a Mini DisplayPort receptacle. The first two features have been confirmed; however the third is still dubious.
However judging by the size of the hole, a Mini DisplayPort seems pretty much a likely inclusion Apple will make for the sake of offering choice. This considering the fact that you might still have to send your video streams over an untethered AirPlay connection.