For all those who are eagerly waiting for their L5 and maybe own a RaspberryPi. It is possible to test Phosh on the RPi3 and the official touch display (for sure also with external HDMI-displays).
I simply followed the very good and simple instructions from postmarket-OS from here https://wiki.postmarketos.org/wiki/Raspberry_Pi_3
and could test Phosh within 20 min.
The official display is a bit too low regarding original resolution why GUI-elements are cut off but I think this can easily be adjusted in a config file before startup.
Up to now I only tested Firefox which works well. Very often the flash-indicator-symbol (see the pictures) for low battery is shown but this is known also from Raspbian. For some testing and giving feedback this should be enough.
BTW: First thing I noticed when working in Landscape mode is that a automatically removed top-bar would help alot and a possibility for scaling the Top- and Bottom-Bar would be good!