As you know, iTunes 11 coming in october with brand new UI. I looked on apple website and I just noticed that the window having new lighter grey colors, flatter window borders and glassier window control buttons (x - +) with almost no border. Maybe OS X 10.9 design started to appear...?
Those window control buttons starting to look like a little bit retro for me.
I think it looks quite nice, a definite improvement over what we are used to. It looks great without the sidebar, IMO it was pointless and it makes more sense to have the buttons at the top. I can't wait to get my hands on it.
I really like the look aside from that terrible center display with the apple logo. It looks like someone cut a section of the app out and that's the background underneath.
iTunes updater won't work, insists that 10.6.3 is the newest build. Very strange
iTunes 11 won't be out before late October. You can manually download iTunes 10.7 from Apple Software Update or http://www.apple.com/itunes - it looks largely the same as the current version though.