Visually and aesthetically, Apple is doing the right thing by going black for its new default UI theme. When I was designing a theme in 2004 for Gnome I researched quite a bit as to what would please me personally and at the same time be usable and easy to interact with. Shiny or leather black on cream-mat color was the best choice I could find. Apple is going shiny black on black (and I believe that leather semi-shiny black for wm/widgets on cream color windows is the best choice) but nevertheless I think their new UI will look very modern. Can’t wait to see an actual screenshot.