One concern is that Ubuntu is probably shaping up to start rolling release and Wayland support in 14.10, and they face a current real issue of dealing with X in the embedded space. If the launch the phone with 14.04 (though, they don't have much of a choice if aiming for an H1 release) they end up ripping out the graphics stack half a year or a year later if they use X.
And there are still those awful rumors of Canonical writing their own windowing server and compositor. They spread themselves so thin sometimes that you rip the bread apart.
And there are still those awful rumors of Canonical writing their own windowing server and compositor. They spread themselves so thin sometimes that you rip the bread apart.