great to see this as an official announcement!
philm and oberon have already talked about this in the internal forum and we promised to not leak it. they wanted the opportunity to announce it themselves.
i have already bought a raspberry pie 3 in order to start testing. i am not certain, whether manjaro lxqt can be ported to ARMv8, but i am already using lxqt with kwin. this is a good beginning.
the next stable release of qt will fix a bug and wayland will start to work again. then, i can start to test lxqt + kwin on wayland.
if this works, lxqt + kwin + wayland should work on ARM as a light-weight version of "plasma mobile".
edit: for everybody not knowing plasma mobile: it is basically a working KDE desktop (based on kwin + wayland) for devices with any screen size and it is already working on ARM devices. give it a test run, if you are interested in experimenting with your smart phone (or other ARM devices)!