Front
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.
Status LCD
A status LCD replaces the exposure compensation dial on the top of the camera.
Back
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.
Battery grip
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.
Battery grip
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.