Good video, very much worth watching despite the length. New UI will look something like this:
with an option for a more classic look.
Looks like an enourmous UX improvement too, and a rewrite to QT and eliminating a lot of technical debt will make development faster.
I actually like FreeCAD and its UI a lot and the recent improvements are huge! Yes it has its quirks but for a tool as versatile as FreeCAD they are acceptable.