We can't confirm that the iPad back case in these photos is real, but it certainly lines up with Apple's own patents: this purported shot of the next iPad's back case clearly shows off dual dock connectors.
The pictures posted at Mission Repair certainly look genuine enough, especially when you this new case is directly compared to the current generation:
What else can we glean? Well, clearly this isn't the 7-inch model that had been rumoured. And there's no space for a rear-facing camera - although that thankfully doesn't preclude a front-facing FaceTime camera. [Mission Repair]