I don't want/need a larger sensor.
I'm not in need for an exotic camera. an XT-1 with a 20mpx x-trans sensor (we can imagine a 1 stop improvment in image quality over the previous generation) with an improved af system, 8-9 fps with a good buffer and exr III, improved evf in high contrast situation and low light situation.
but this is just the logical evolution of the camera. what I'd like to see is a little larger grip in order to implement a larger battery (500 shots would be nice), more clicky and bumpy 4 way buttons, a more solid sd card slot door aaaaaand... a 5 axis stab (like sony a7 II or oly em1 and 5)
to me, such a camera would kill the interest of any FF. here's why.
1- definition is way enough for 99% of the photographers.
2- since the new firmware will increase af sensitivity to 0,5 ev, a brand new af system would probably go above 0 (that's more a dslr vs hybrid argument)
3- 6400 isos would give very good results (I guess same as XT-1 at 3200)
should I even mention size, weight and price of the gear?
oh I almost forgot. same stuff for a X200.