Ah yeah, I guessed that's why they only had a chroot until now, but what if you modified the system to load X11/Gnome at the end of boot instead of going into their own proprietary desktop environment?
With the announcement of WebOS open source, it should theoretically become possible. Luna is just a desktop environment overtop a fairly normal Linux system. There might need to be a few extra packages installed to get Gnome 3 or Unity running, but as long as they can grab access to the video processor, it should be do-able. One more thing to look forward to.