Coming in the next update of OS X.
Are you lucky enough to have one of the new MacBook Pro models with Retina display, you’ll soon be able to run 4K (3840 x 2160) from the HDMI port with 60Hz frame rate.
Coming in the next version
So far, Retina MacBook Pro only been able to run 4K with 24Hz or 30Hz via HDMI.
In the next version of Mavericks – version 10.9.3 – is 60Hz Opportunity entered.