Apple released MacBook Air and MacBook Pro Update 2.0 on Thursday, a software update that Apple recommends for, "all Mac notebooks introduced in June 2012."
The sparse update notes say simply, "This update includes graphics performance and reliability enhancements and improves compatibility with some USB devices."
You can download the update directly from its KnowledgeBase webpage (127.07MB) or through the Mac App Store if you have a Mac eligible for the update.