MacBook Air EFI Firmware Update 2.6
Apple has issued EFI Firmware Update 2.6 for the MacBook Air models that were released in June 2012. The update resolves a color issue with connected HDMI displays, a bug that caused the system to freeze if a Thunderbolt device was unplugged while in standby mode, and a problem with properly booting Windows using Boot Camp. It requires OS X 10.8.2 Mountain Lion. As always with firmware updates, we recommend relying on the App Store to ensure you get the firmware update for your specific model and being careful not to interrupt the update process. (Free, 4.76 MB)
It also fixes a bug that bugged me greatly: until now, these models seemed to be the only ones which would not support audio via asynchronous USB DACs.