Fujifilm increased the size of the grip from the X-T2, which gave it room to move to a modern shutter button, away from the old-fashioned button with a cable-release socket.
A status LCD replaces the exposure compensation dial on the top of the camera.
The cosmetics are a little different and the thumb rest is a little bigger, but the most notable change on the back is the addition of an AF-On button. It also has a slightly more pronounced thumb rest, where the now more easily reachable quick-menu button lives.
Want reasonable battery life? You'll need the optional vertical grip that holds two more batteries, bringing the total rated life to about 900 shots.
As with the X-T2, a "boost" option on the grip will have the camera use the extra batteries to provide a higher frame rate during continuous shooting.