The Fujifilm X-T4 X-mount mirrorless camera is expected to be announced in the second half of 2020. Here is design patent that leaked online.
Fujifilm has just registered a new camera code FF190003 at Bluetooth SIG. So we are now have a total of three unannounced cameras to be announced next 1-3 months:
Fujifilm has just registered a new camera code “FF190001” in China. Along with previous unannounced camera code “FF190002”, currently there are a total of 2 new cameras unannounced.