This is just a thought since looking at where we are with Canons EOS Bodies..
I reckon the following is a simplified view of where Canon see their bodies and the lines/levels of development:
FULL FRAME BODIES
Mid-range: 5D Mk III
Top-end: 1D X
Notice that under the crop bodies there is nowhere for the xxD range. I'm seriously wondering given the ability of the xxxD range now starting with the 650D that there is no longer room/a need for the xxD range, and that the 60D/60Da will be the last in that line. It does simplify things somewhat in a similar way to the merging of the xD and xDS ranges.
What do you reckon? Am I on to something here or is this utter tosh?