I think the point is, Canonical needs OEM partners who are willing to pay for engineering services to offset the costs to get to the final deliverable product. And a lot of what we see right now is visioneering of the final concept using Android as a shortcut to get something into the hands of prospective partners, partners who will put money into bringing the final vision forward.
I wouldn't get too bogged down in the technical details of the preview.
It's already been reported that Jono has commented on the particular issue of a custom display server. Canonical is working on a custom display server specifically to meet their needs. Not X, Not Wayland. I fully expect Canonical to talk about their plans in the display server space soon and give more detail. Especially now that its obvious to everyone they are rebasing on Android to launch their mobile. They really do have to explain how they plan to bridge the Android/traditional X server space. It could be they plan to run an Xserver on top of Android for _legacy_ desktop applications. It's not impossible to imagine.
-jef"In an alternative universe there is a version of Canonical using kickstarter to crowdsource funding for new concepts. The actor Jerry O'Connell has taken me there, and its an eerie sort of place, with Ubuntu branded electronics everywhere."spaleta