Our aim is to make the UI as simple and streamlined as possible. Removing as many textures and unnecessary crap as possible to increase performance and reduce complexity.
If there is to be complexity, we are saving that for functionality. Prettiness will not be part of the UI makeup. I have seen far, far too many designs that are vastly complicated, don't work in 4:3, or don't work in 16:9, or don't scale, or don't work on a TV screen, or don't work on a monitor.
The focus not just of the UI, but the game, is on functionality. Just because we could make it look "better" - doesn't mean its the best option to take to achieve functional requirements.
Expect the UI system to get more functionality. Do not expect it to look "better". I would trade the prettiest UI in the world for one additional feature, if it came down to it. UI work does not just require a designer, it nearly always also requires a programmer. Usually an experienced one.