Just now Fuji announced the new X-T4 (specs here). It’s the most advanced APS-C camera yet. Fujirumors reports that the camera will ship in late April or early May at earliest because of the Coronavirus outbreak.
I guess that all manufacturers including Sony will have issues with the production too. If things get even worse we might get a new A7IV or A7sIV in very late 2020 only :(
Full coverage at Fujirumors.