The new Dell XPS 13 developer edition sports a 1080p 13.3" screen and comes preinstalled with Ubuntu. I have not seen one in person, so it is possible that it requires a magnifying glass to use, but it seems that Dell is willing to give it a shot. Are there specific patches that they've used to make the higher resolution usable?
It's hard to say for sure without seeing it. My guess is that the UI is too small to be really usable.