The picture pretty much speaks for itself. It's the new White Dwarf subscription model. It's a Squat! Not a dwarf, as most people thought. It's got a boiler suit, servo-arm and space helmet.
Ther big question though, is whether this is a one off model or are they on their way back. I'm guessing, considering the 'squats and space dwarves never happened' stance of GW until now, is that it's unlikely to be a one off.