I haven't been following it properly, but I remember talk for several years now that the Android kernel would be mainlining. I assume that would mean that the drivers would work for mainline kernel and that should mean both x11 and surfaceflinger(or whatever android uses for video) would both be options from that point on.
I believe that is what Ubuntu is banking on to get a more ubuntu experience onto their phone OS. I gave ubuntu a try, but the big sticky points were the weak compatible software ecosystem while x11 apps are unavailable as well as the creep factor of needing a launchpad login to access the repos.
I am sticking with my N900 and BT tethering a WiFI Nexus-7(flo), in a microUSB keyboard folding case, with Cyanogen(block APK install permissions!) and F-droid repos(no Google and GooglePlay snoops) until I can get a real Linux replacement phone and tethered tablet. Maybe that will be a de-creepified fork of future Ubuntu touch.