There is always a tension between the truth that the newer camera is an improvement over the older model and the truth that one can make beautiful photographs with the older camera. The right answer is going to depend a lot on persona things: How do you feel about spending the money on the newer camera? How large do you print and how often? Is this an "only camera" or one of several that are specialized for different aspects of your photography? How important is photography to you? And more...
If you don't have a camera in the broad category filled by the Fujifilm cameras, then the question of getting the XPro2 or waiting for the XT2 is a valid one. Each camera has its pluses and minuses, and the real question is likely whether what we know about the XPro2 or what we suspect about the XT2 will fit better with your particular needs and preferences. If the past is a guide, it is very likely that both will produce equal image quality, and the differences will largely be functional and operational, so think a lot about the the form factors. Ask yourself questions like, "If the XT2 were announced first, would I wait for the XPro 2?" or "If both were announced at the same time, which would I select?"
The XPro1 is still a very useful camera, and at the current prices (body only as low as $499) it certainly has value commensurate with its price. If it does what you need done and if cost is an issue, this is a fine way to get a good mirrorless Fujifilm camera at an excellent price. On the other hand, the XPro2 brings a number of real and likely consequential improvements that make it worth the higher price for may folks.