Well... you asked for my list
I can't see the point of going past 45mp. It matches 8k/4k/2k resolutions perfectly and downsampling from >45mps to 8k is just extra processing power from 8.6k to 8k on the A1. Cropping would be worse I guess. Canon would go higher in price than the A1 to protect 1DXiii and the rugged 1D body form factor with the goodies below. Sync speed increase would be nice. Flippy screen should be there.
My guess for R1 is minimum specs as R5 but in 1D body ( AF-On smart controller buttons, dual CFe slots) with:
- Global shutter (no mechanical shutter). Rolling shutter artifacts significantly better than current electronic shutter
- 45mp sensor with IBIS (IBIS can be turned off)
- 30fps electronic shutter burst with full tracking - perhaps with buffer ie not unlimited
- ~20mp on-the fly over sampled (no lossy compression/cRAW/S-RAW) at full 30fps unlimited buffer. Best of both worlds.
- Dual Digic X to spread the heat generation and generate less heat per CPU
- Unlimited 8k cinema raw lite internal recording to CFe card capacity
- 6K/60. 4k/120 unlimited no crop internal recording.
- No line skipping/pixel binning 4k/6k modes ie oversampled from full sensor width
- 29:59 recording limit
- Clog2/3
- minimum 16fps using anti-flicker depending on frequency of the flicker lighting
- AF in very low light (quad pixel makes sense but would be equivalent to a 180mp sensor!)
- pixel shift high res stills
- 9+ megadot EFV with no blackout and fast refresh rates (at least 120fps). >0.5" in size
- full sized HDMI 2.1 port (48G) or thunderbolt 3 USB-C or both
- Mini XLR audio option
- Ethernet port
- Flippy screen included. This one I am not sure on but still needed I think. Weather sealing will need to be excellent though
USD10k
Won't directly compete with cinema line due to form factor but there will be a similar specced cinema form factor with unlimited 8k raw option, heaps of buttons and vented/fan cooled. Cxxx option will be more expensive.