I posted
my prediction here in summer 2017:
My guess is that BMD will build on the URSA Mini 4.6k and its sensor and will improve that design further.
For a hypothetical UMP MKII I could realistically see a further improved sensor with maybe 6 dB less noise, an option to do in-camera Noise Reduction, higher frame rates like 120fps in full raster and 240fps windowed, slightly improved DR of ~ +1 stop, improved calibration methods, an improved debayering algorithm with better anti-aliasing and moire suppression. I could imagine a slightly redesigned camera body with the bigger LCD of the UM46k, with more brightness for better readability in sunshine, some tweaks for buttons and switches alignment, a function wise more useful side handle grip, maybe additional support for the next generation of CFast: CFexpress (v1.0 ... 1970 MB/s up to 7880 MB/s). Maybe a bigger internal buffer for a few seconds of pre-cache-recording and a few seconds of highspeed fps in burst mode. They are certainly trying to get global shutter working with the next gen - but who knows.
And of course some further refining of the camera firmware.
I'd expect a UMP MKII not before summer 2019, as it seems there is missing some new technology like CFexpress cards ATM. And a MKII in summer 2018 would kill sales of the current UMP.
That would be my prediction for their next camera. I don't see them working on a 8k version yet as that wouldn't make much sense at the moment (in my opinion). That could be later in a MKIII then.
Of course Grant Petty and his team might have some crazy ideas in petto I am not even dreaming about