They already have a UI for buttons, etc, so I'm sure it applies to 2d. That's another big improvement coming for the next version because they made it a lot cooler to work with. Vector graphics would be interesting. It might be in the works for later. I think they probably chose raster because a lot of games mix 2d and 3d now days in different ways.
A couple other things they've done recently is added real time shadows to the free version, just hard shadows, but that's ok with me. They also added baked navmesh to the free version.
Unity reminds me so much of Blender because it's cool, but it's also kind of odd and hard to get used to, and learning it is a moving target.