The next Fujifilm X-H2 camera will have a new stacked, back-illuminated, X-Trans sensor - this was hinted today at the 2021 Fujifilm X Summit event:
"If you followed the Fujifilm X Summit closely Fujifilm announced the development of the Fujifilm X-H2 without saying it directly with the announcement of the new Stacked Layered BSI X-Trans Sensor coming to Fujifilm cameras."
Via FujiAddict