Actually the only reason I bought the 5D3 was that I was really waiting for what I call the 2DX. A full frame camera with 44 mpx, 2 digilogic 6 processors, USB 3, uncompressed HDMI out for digital recorders and field monitors, 1D style with the vertical grip built-in for around $4,500 (maybe $5,000). I think 6 fps is sufficient and of course the 1dX autofocus that the 5d3 already has.
I guess they could call it the 4DX. I at first thought it would be called the 3DX but then I realized that calling anything as the 3D anything might be misleading.... Unless they actually build a .....
Calling it the 10000X would be more appropriate given the price point a camera with those specs would likely come in at.