I've been using E17 as my main desktop environment for almost a year now. I know it's been in devlopment for over a decade (and may never actually see a "stable" release), but it's still a very impressive DE.
Personally, I think it runs great on top of X11. I don't really see any glaring deficiencies as it is, so I'm not exactly waiting breathlessly for a stable Wayland port. But I'm all for progress, and I'm glad to see the Enlightenment developers doing such good work.
Actually, development on the Wayland port did not "officially" start until December. The stuff posted in November was just me getting familiar with the Wayland code. I am glad that people are finding interest in this tho
Yes, the EFL libraries like evas, ecore, ecore_evas, and elementary all render in Wayland now using Shared Memory or EGL. With regard to the speed at which this was accomplished ... I will just say, it's been a long road The Enlightenment libraries themselves are known for running on various devices pretty easily due to their modular design. That being said, the Wayland port was no easy task tho mainly due to figuring out how Wayland works manually (sadly, documentation is a bit lacking) but the folks at Wayland have been incredibly helpful in this regard...they always took the time to answer my silly questions and have been very helpful in making this all happen. I look forward to working with them some more !!
With regard to why we are creating our own compositor...in my opinion, the wayland demo compositor (weston) is nice, but it's just that ... a demo, and thus does not provide all the features that we need or want to port the actually E17 window manager to Wayland.