Fujifilm issued an official notice for X-T1 owners today. A “malfunction” that can cause the camera to freeze when shooting in AF-C mode was found. If your camera is acting up, it can be remedied by way of Firmware Ver.4.21. A new version of the firmware that includes the new features in 4.20 will be posted in January.
Bummer, but nice to see Fuji taking quick ownership of this one.