I'm getting ready to move up to a K-3II by the end of this year or moving up to the next generation APS-C flagship by the end of 2019 or 2020. It all depends on if Pentax spills the beans about the next generation flagship this year. The K-3II is already a lot better at shooting than my K-50, but these 3 improvements for the next flagship would be great.
- Improved AF, especially the AF.C for objects moving towards me or going away from me in low light. My K-50 can't do this at all. It struggles horribly in low light. The K-3II does better, but not by that much. My dad's Nikon D7200 does pretty well here. I can only imagine the AF in the Nikon D500, but I'm not asking for D500 technology here. Just better AF overall.
- Better high ISO image quality. To me, 'cause people have different tolerance for noise, the K-3II is good up to ISO 6400 & still decent up to ISO 12800. I wouldn't really have a problem setting the auto ISO up to 12800 on the K-3II, but I would prefer not to continuously shoot past ISO 6400. It would be great if ISO 12800 would be more usable like ISO 6400 is.
- Better SR. If they can implement the 5-axis IBIS, this would RAWK everyone's SAWKS! The K-3II's SR is already pretty great, but 5-axis would be awesome. Canon & Nikon have nothing to match this. Only expensive stabilized lenses.
Just those 3 things would be enough for me to wait. Everything else added, tweaked, or even obsolete features removed would be a plus. If it still ends up being similar to the K-3II, then I'll just get the K-3II later.