This is when it all gets confusing. SE has never been anything “combined”, “redesigned”, etc. So far it has always reused the previous generations chassis. I guess it could be either XR or XS bodies with fresher internals. Then, if the next SE is XS-based, changing the screen tech from OLED to LCD would imply buying additional panels for a device that might not sell so well. Mini 12-13 won’t do either, as they are quite expensive to make and 13 mini is still being sold for 599$. So XR chassis are quite likely, as Apple could have a sub-500$ phone that is cheap to make, has a good battery, offers an LCD screen for people preferring it over OLED and is “big enough”, adding to the feeling that one gets “more for less”, which has been SE philosophy.
As a 12 mini user, I am planning to wait until next spring to see what that new SE is like and then probably get either that or 13 mini.