Look's like the AF is going be really good. Which is saying something since the current AF on the T2/Pro2/H1 is already good.
Fujifilm X-T3 Autofocus: Phase Detection on Entire Sensor, 425 AF points, Improved Face/Eye Detection and Better Low Light AF - Fuji Rumors
Fujifilm X-T3 Autofocus: Phase Detection on Entire Sensor, 425 AF points, Improved Face/Eye Detection and Better Low Light AF - Fuji Rumors