It's great that they're implementing a new desktop. I usually say "The more the merrier." But, alas, Lumina is Qt based, and for me that puts it into the same general camp as KDE, only different. What I'd really like to see is a very platform agnostic minimalistic desktop that does not depend on specific operating systems or specific software stacks such as the ubiquitous (bloated) graphics king of the open source world (X, X+Qt, X+GTK, etc).
It could be very minimalistic in the way the Haiku operating system's desktop is, and have only a few of the most interesting drivers, relying mostly on VESA. Such a great thing could be a drop-in replacement for graphics on any platform, perhaps including bare-metal and bare-metal+ setups, light and heavy embedded, phone, etc. There is already one such project out there, but it's not as minimalistic as I would like, and probably not portable down to small embedded device systems. But, carry on :beergrin