What started one year ago as a (now canceled) slide-out keyboard mod for the Moto Z lineup turned into a smartphone with a QWERTY keyboard that is expected to hit the market in Q1 2019. The Android Pie-driven F(x) handset will come with curved sides and a 6-inch AMOLED display, but the other specs are not public yet.
https://www.notebookcheck.net/F-x-Technology-is-working-on-6-inch-handset-with-a-slide-out-keyboard-design.396746.0.html