MacStories has the story on this one. Apple has updated Aperture to 3.3 and iPhoto to 9.3 which not only give them a Retina Display for the new MacBook Pro, but also unify their libraries, so you can make modifications in either program without having to duplicate the images! This is so very cool! If only they would allow third parties to also do this so Lightroom could do the same, but that will never happen! Still this makes Aperature so much more usefull! Very very cool!
Of course it also means programs like iPhoto Library Manager will need to be updated for this new update to work properly, but still this is a very exciting new feature.