I'm quite happy with the XPro3 but if the XPro4 has the 40 MP sensor with pixel shift - it would be very tempting. I expect they will update the EVF as the update in the XH2 is pretty impressive.As an x-pro3 owner, and previously the 1 & 2 versions I’m pretty happy with it as it is. I don’t feel the camera is lacking in capabilities, don’t need IBIS, or a 40mp sensor, although probably will happen.
Happy with the screen, EVF & OVF, although preferred the x-pro1/2 OVF and would like to see it revert to that.
Beyond that, more than happy.
As far as the screen goes - either leave it as is or go to a FAS. I want a screen that I can turn against the body to protect. I'm fine with the Pro3 drop down. I'd be fine with the FAS similar to the XT4 or XH2S. I would not be fine with any other design. If there is a design problem related to the ribbon cable - then fix that (that's why you hire engineers) and don't throw out the baby with the bath water. It is unclear at this point if a) the failure rate is greater than one would expect at random and if it is if it is caused by a design issue or a bad batch of cables.
IBIS - if it does not add one gram of weight, or add one nanometer is any linear dimension or reduce the battery life by one nanosecond and does not cause design trades in other areas like EVF/OFV hybrid finder, then I can live with it. Other wise no.
