9to5Mac posted a story that Apple seems to release shortly Mac computers that support super-fast 802.11ac Gigabit wireless

Apple is preparing to soon release new Mac computers that support super-fast 802.11ac Gigabit wireless, according to code-findings inside of Apple’s latest OS X Mountain Lion 10.8.4 beta seed to developers. The code was located by a tipster inside of the operating system’s WiFi-frameworks folder. As you can see in the image directly below, the 802.11ac code is not found in OS X 10.8.3, which is the latest public release of Apple’s Mac operating system.

  OS X 10.8.4 code confirms new Macs incoming with super-fast 802.11ac Gigabit wireless support