Retina iMacs with OS X Yosemite in late testing within Apple, could launch soon | 9to5Mac

I haven't checked Emergent on the latest Mac rumors yet...

"The Retina iMac will mark Apple’s first foray into Retina desktop computers. Apple first launched the Retina display with the iPhone 4 in 2010, expanded it to the iPad in early 2012, and brought the screen to the Mac with Retina MacBook Pros in late-2012. As for the resolution of the new Retina iMac, OS X Yosemite betas include references to 6400 x 3600, 5760×3240, and 4096×2304 resolution screens. Apple has been rumored to be working on a 5K iMac display for launch later this year, so perhaps that’s the direction Apple will take, and a recently introduced DisplayPort standard update could make this a reality."

Retina iMacs with OS X Yosemite in late testing within Apple, could launch soon | 9to5Mac