Apple has released an update for the just-released MacBook Air, to go along with nearly launch-day updates to the new MacBook Pro and the MacBook Pro with Retina display.
The update weighs in at 1.06GB and fixes several issues:
About MacBook Air (Mid 2012) Software Update 1.0
This update is recommended for MacBook Air (mid 2012) models.
The update includes fixes that improve graphics stability, flash performance, and external display support.