It would be nice to hear when the in-game guild bank is going to be implemented. I know that isn't a part of the UI per se, but inquiring minds want to know...
I would also like to see it possible for us to be able to move and resize the default Blizzard UI windows (such as Quest Log, Bank, Bags, Professions, Talents, so that the contents are visible on one window without having to scroll through them or "minimize" parts of them so that you can see the content you are interested in seeing.
Back in the day, about 2 years ago now, I guess, I had suggested to Blizzard that they implement a keyring in the game. At least Blizzard got that one right.
