It seems that the Mac Retina Displays are going to be one of the releases from WWDC San Francisco. As highlighted in the picture, apps on Apple’s Mac App Store received graphics with Retina-ready graphics.
The updates have been added recently, for example in the app FolderWatch that sync and mirrors documents and files automatically, provided the Retina graphics as a new element in the version 2.0.4. This is a clear proof that Apple will release new high-resolution Mac Retina Display at the WWDC. The conference is also predicted to provide iOS 6, OS X Mountain Lion, Mini iPad and many more.