Apple could launch new MacBook Pro, MacBook Airs with Retina Displays at WWDC

Apple’s annual World Wide Developers Conference (WWDC) is exactly a week away and we are hearing more murmurings about what could be launched at the event. While Apple has so far teased us enough to expect a preview of iOS 6, 9to5mac is reporting that Apple could lift the curtains off its 2012 range of MacBooks, all equipped with Retina Displays! Apple could make as many as four Mac-related announcements at WWDC.
While we were already expecting a thinner, almost MacBook Air-like 15-inch MacBook Pro with Retina Display, the site is now reporting that Apple could also launch the new generation of MacBook Airs (both 11-inch and 13-inch). The new MacBook Air will also sport Retina Displays.
The third launch would be a new iMac, sadly about which not much is known. Apple could go for a higher resolution display, keeping with the general theme or could also go for a design refresh. The fourth announcement is not clear at the moment and could either be related to the Mac Mini or the Mac Pro.