The long wait is over… 
ADD: See my Preview of an early specimen here
After the cancelled project with a QWERTY-slider MOD for the Moto Z-series, we should finally get a real tilt-slider, in a modern version of the form factor of the good old Nokia N97mini, E7, N950 and others.
The PRO¹ has (finally), been launched see https://www.fxtec.com/pro1/
The last landscape slider with decent specs that was world widely available was SonyEricsson (Neo) Pro back in 2011. And of course the huge over 77mm wide BB Priv in 2015 with the keyboard the wrong way as the last time any keyboard slider was released (AFAIK).
Here a gif from Venturebeat
I’m sure the nerds are going to tease it for being Snapdragon 835, but on the other hand it helps the price not sky rocketing more than the €649 including vat.
Here is a tiny video from XDA https://www.xda-developers.com/fxtec-pro-1-initial-review/ (shortened) with the sound that some of us just love to hear.
I have been eagerly anticipating this device, as can be seen here