Fujifilm’s non-marketed digital camera code “FF200003” has been registered with an overseas certification body (X-S10 is FF200001). This model is equipped with Wi-Fi and Bluetooth 4.2. Although there are no features or additional details, we think this new camera is the Fujifilm X-E4, which is expected to be announced in early 2021.

It looks like Fujifilm will continue to place the same 26MP sensor in different bodies. 
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https://www.dailycameranews.com/2020/10/new-fujifilm-camera-registered-fuji-x-e4-on-the-way/