Just six days after the previous release, Apple on Tuesday has released a new version of the forthcoming 10.8.4 update to developers. The new build, 12E36, lists no known changes or issues, and asks developers again to focus on Wi-Fi, Safari and graphics drivers. It is known that the new build includes support for the emerging 802.11ac standard, suggesting possible new model updates that will also support the protocols. The 10.8.4 release is also said to improve battery life somewhat, and issues with Wi-Fi and waking from sleep.
