My beloved Fuji GFX50S will get a successor in 2019. At Photokina 2018 Fuji announced the development of the GFX100S and also showed a prototype. And while 102mpx are something crazy enough to make me want to upgrade, this camera has a lot more going on that makes me quite happy. It will feature Phase-Detection Autofocus, it will bring internal Image-Stabilization, and Fuji seems to tease 4k-video at full sensor-readout. It also does record 4:2:0 internally and 4:2:2 over HDMI. I'm not getting my hopes too high for that full-sensor readout, but if they can do video using a sensor-area significantly bigger than FF35, then this would be a huge thing. Think VistaVision-like filming for under 10000USD.
Can't wait! ;-)