Developers already have their hands on a beta version of OS X 10.9.3, and it sports a big change for 4K display users: Retina support. The higher resolution option is showing up in system preferences for Mac users.
OS X Mavericks 10.9.3 to include 4K display Retina support
9to5 Mac managed to get ahold of the non-public beta and tested the feature on a late 2013 Retina Display MacBook Pro connected to a 4K Seiki monitor. As you would expect, text was significantly sharper because the Mac is sending double the resolution.
Assuming the feature isn't dropped before the beta ships as an official update, the Retina MacBook Pro will be able to drive 4K displays at 60Hz instead of the 30Hz it's currently limited to.
Apple isn't saying when the OS X 10.9.3 update for Mavericks will ship, but considering OS X 10.9.2 was released just over a week ago, it's a pretty safe bet Retina MacBook Pro owners will have to patiently wait for 4K Retina support.
[Some image elements courtesy Shutterstock]