Recently I purchased a MacBook Pro with Retina display and believe me Apple has done an incredible job with the next-gen MacBook Pro. The Retina display is a powerhouse. Almost everything else in native apps and photos looks amazingly crisp and clear on the Retina display. But for me as a developer when I started Eclipse first time, retina UI was not supporting Eclipse display very well. So here is the workaround to update UI:
Contents->Info.plist by clicking on "Show package contents" on the Eclipse.app. Then Just above
Then, log out and restart the Eclipse. This also works for Aptana as well as for Titanium Studio and in general for all IDEs that are built on top of Eclipse.