I'd like to have an X-Pro 2 minus OVF, plus tilt screen in X-E2 size.
Pretty much this.
I absolutely adore the X-Pro2, but half the reason I got rid of my full size SLR (Canon 5D2) was that I was still doing all my shooting with a Rebel even though I had this big beautiful body sitting there.
Even with a 400mm lens, having a compact body is important because the camera is constantly rubbing against your body when you go hiking, and I can fit a compact body in my lens case, and the lens with body can be packed together, and even if you have a smaller lens, running around every day with an obviously high end camera paints you as a target for thugs and junkies. Not to mention I can be as hazardous to my own equipment as anyone.
I don't actually want an OVF either. I mean, I "want" one, but I all the functionality I need is on the EVF (manual focusing wide aperture lenses, intuitive awareness of exposure, etc...), the way I want to shoot a Fuji is with the EVF. So that would make the X-T2 a prime candidate, but I still want the rangefinder layout. Having room for my nose sounds nice, and again, I don't want the hump so that my camera packs better.
The X-E3 is the body I want, both the price and the layout.
The only thing I "need" from Fuji in the X-E3 is the new sensor and new menus, that's why I don't have an X-E2 right now, by the time I knew I wanted one it seemed like the system was ripe for an upgrade.
1. New Sensor and Processor (Lots of Pixels and good High ISO)
2. UI improvements (Menu and Button Layout).
3. Tilt Screen
4. Make sure it still has an ISO dial.
5. More battery is always nice (400 shots would be good)