According to FujiAddict, Along with the upcoming Fujifilm X-H1 in ealry 2018, Fujifilm will also announce a new X-mount mirrorless camera named Fujifilm X-T3. Fujifilm X-T3 is rumored to be announced at Photokina 2018 in September.
According to FA, X-T3 will have a brand new image sensor, and the max framerate will be 4k 60p. While X-H1 will still be 4K 30p.
via: FujiAddict