So, I'm probably going to purchase a A7RII but I'm still looking forward to the 5D4. If canon still puts a decent product, I could be swayed to hold off my purchase of the A7RII for native mount lenses/flashes.
This is what I'd like to see.
1. 32mp or higher MP with improved IQ. 24-28 MP is more than enough for me. Much more important to have noise-free images and high dynamic range at ISO 1600-6400
2. AF & Metering improvements from the 7D2. Yes, definitely.
3. ALL Crosstype AF Yes, definitely.
4. Fixed Blinking AF point fix. Try switching to AI FOCUS or ONE-SHOT if the blinking AF points irritate you.
5. 1/250th Sync Speed bump. Yes, useful, but I rarely use flash
6. Dual CF. No, I'd rather have dual SD. No pins to bend,
7. 7 FPS. I certainly don't need more than that, but I'd like a quiet shutter at 6-7fps
8. Dual Pixel AF. Yes, definitely makes a huge difference for live-view focussing
9. 4K Video with S-log of some sort. Don't need it. I'd rather see a dedicated 4K camera for movie enthusiasts. Concentrate on making the 5Dx the best stills camera.
10. Touchscreen. Not sure. Very useful, but how long would a touch screen work properly on a camera subjected to professional usage. For the same reason I'd rather have a fixed screen, and I definitely don't want a built-in flash. First priorioty should be durability/reliability in tough working conditions.
11. RAW 1080P if possible. Don't need it personally.
12. Built-in RT flash controller. Yes, and a decent, affordable wireless macro flash needs to be in the system.
13. Peaking and Zebra. Yes, so long as it can be switched off for those of us who find it obtrusive.
14. USB Type-C/3.0. No, look at the fragility of this connection on the 7DMkii. Stay with USB2.
15. 3499$ or Less at launch.