Apple just announced that OS X 10.7 Lion and 10.8 Mountain Lion will be updated to support the new 2880 x 1800 Retina Display in the next-generation MacBook Pro, which ships today. The entire OS has been tweaked to support the higher resolution, as have most of Apple's apps, including Mail, Safari, Aperture, and Final Cut Pro.
Apple's also touting a number of key third-party apps that have been updated for the new display, like Adobe Photoshop and AutoCAD. There's also a new version of Diablo III, whichis a bit more fun.
Developing. Check out our Apple WWDC live blog for the latest updates!