I would have to dig in to it deeper, but my questions about it would be:
1000 frame buffer, Raw+JPEG. Is that 1000 of the largest size files or lower settings.
16 fps, is that with tracking. What is the fps for continuous shooting and tracking.

I was hoping they would add a few mp, but it seems Canon is still trying to up the fps. Hopefully they realized on this round that they matched the old silent films rate of 16 fps. Those photographers that need more than 16 fps I would think are a small minority.

I was thinking about the 1Dx III, after seeing the specs I may wait to see what Canon does with the mirror-less this year.