Apple will also announce Retina display-equipped MacBook Airs at this year's WWDC, supply chain sources for 9to5Mac say. The company is already believed to be preparing news of Retina MacBook Pros and iMacs, and an Air would complete the lineup of Macs with built-in displays. 9to5 claims that unlike the Pro, though, the Air's update will be almost entirely about the display, rather than incorporating any major design changes.