It's probably a reasonable expectation that Canon would release a 1DX3 prior to the 2020 Olympic games. If dual DIGIC 8+ processors can yield 50% more throughput than the dual DIGIC 6+ processors in the 1DX2 (I'm assuming that's not a stretch), then it's possible for the 1DX3 to sport a 30MP sensor at the same 16fps of the 1DX2 - I think the bump in resolution and improved noise management at high ISO would be welcome additions in the wake of an increasingly competitive full-frame market.
My personal wishlist for some new features on such a camera would be:
- 30MP DPAF sensor
- CR3 & C-RAW support
- IBIS (hybrid OIS/IBIS mode) & high-res pixel-shift mode
- Articulating touchscreen
- Unlimited RAW buffer (using C-RAW)
- Dual CF-Express card slots
- Uncropped 4k/60fps & 1080p/240fps
- Zebra, focus peaking, and waveform monitoring
- XLR jack for integrated high-quality audio
- Full cross-type phase-detection AF array
The 1DX2 is already one hell of a camera. But if Canon tossed in some of the above features on a new model, then they I'll probably refinance my house and pre-order one