by Abe Abrahamian--5.17.12
Apple is working on a Mac Book pro with a Retina Display resolution of 2880x1800 at 220 ppi. The World Wide Developers Conference is in June and we will hopefully have more information on this powerful new Mac Book Pro. It is also rumored that the new Mac Book pro will be thinner with a USB 3.0 port and two Thunderbolt ports.
Source: MacRumors