Fujifilm will not make an X-H2 ever because it isn’t a unique enough product to sell well and Fujifilm feels it was a mistake to make. Instead, the Fujifilm X-T4 will get IBIS. This seems very plausible and while it is possible that the H line up could come back if Fujifilm can come up with a unique design for it they believe it is highly unlikely.
Fuji X-T4
It should be about 1/3 of an inch thicker and about 5-6oz heavier.
6k60p and 10-bit internal
Anamorphic Ratio Support
Probably fully articulating flippy screen like the S1H