I'm very much looking forward to using (hopefully buying) the CION.
I think I've figured out a more cost effective configuration of the CION by forgoing the AJA Pak media cards and reader and get the Atomos Shogun monitor/recorder for roughly the same price. The Shogun will record 4K at least at 30p to ProRes HQ or CinemaDNG RAW on 2 SSDs or SSHDs of my choosing. Now I have my most used frame rates and preferred codecs plus a great field monitor. (You could go with an Odyssey 7Q for a more money but then your stuck using another proprietary media card) Zacuto's Gratical OLED EVF looks like a promising addition for the CION but that's another $3k.
After talking in person with the guys from AJA a few times they have yet to confirm anything about the ISO range and also if there will be an ability to use different picture profiles such as Sony's S-LOG 2 or Canon's C-Log. They have axed the ability for 3D LUTs however.
It was disappointing to see that there is only one media card slot rather than two for hot swappable media.
At the end of the day you can spend less than $15k and have a killer 4K camera that feels and acts like a real camera. The Blackmagic URSA is much cheaper but has HUGE drawbacks for me and my usual production needs. For me, the CION is the sub $20k camera to have (final conclusion will be made once we get the final production specs and actual footage to view).