^And I think you're being optimistic
I don't expect devs to put much effort on PS4K games until the install base reaches 10 millions, and I doubt they'll really focus on it until it has half of the total PS4 sales. There's no reason to prioritize a game version that will sell hundreds of thousands over one that will sell millions, and I don't expect the PS4 and X1 versions to suffer from it for the same reason, at least the next 12-18 months.
I think it may be something like this for the next couple of 12-18 months
900P@30FPS (Med) for X1
1080P@30FPS (Med/High) For PS4
1080p@30FPS (Very High) for PS4K
It's easier (and probably cheaper) to simply push the visuals a bit further to make use of the extra GPU power of the PS4K.
Beyond that, I can actually see the PS4 suffering the most as devs focus more on PS4K and less on the PS4, to a point where we could see something like
900P@30FPS (Low/Med) for X1
900P@30FPS (Low/Med) For PS4
1080p@30FPS (High) for PS4K
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.