The rumoured MkII specs look promising. Having the K-1 and seeing what is capable of in terms of IQ I'm very interested in how much IQ improvement we will get with the new model. It is important for me that they improved both the normal and PS image quality.
For those that are already unhappy with Pentax I can see there may be more reasons now to go away (although high expectations for a totally different II model is what might ruined it for them). I have to say something and I'm really serious about that! Before you jump ship find good reasons for doing so (e.g. much better AF-C performance, more FPS, deeper buffer, more lens options). There are many. I would advice them though to shoot side by side with some good photographers with D850 and 5DIV with top lenses and compare the results
There might be some surpises. I remind you that at the price of D850 you can get the K-1 + DFA* 70-200/2.8 (about only $100 difference).