According to Nokishita Camera, a new Fujifilm camera code FF200001 has just passed FCC. This Fujifilm FF200001 is equipped with Wi-Fi (802.11b/g/n) and Bluetooth (same RF module as the X-Pro3 model number WM-BN-BM-26 _A_ FF3). The designated date for a public announcement is October 16, 2020.
Since it has same RF module as X-Pro3, so maybe we will see Fujifilm X-Pro4 to be announced in next few weeks. Stay tuned.