Apple Releases iMac and MacBook Pro EFI Updates
Apple has released an EFI update for the new iMac and the 13-Inch Retina Display MacBook Pro.
About iMac EFI Update 2.0
This update is recommended for all iMac (late 2012) models. This update contains general performance fixes pertaining to sleep and Thunderbolt, and improves compatibility when using the 5GHz band in Wi-Fi.
About MacBook Pro Retina EFI Update v1.1
This update is recommended for all 13-inch MacBook Pro with Retina display (late 2012) models. This update improves sleep performance, enhances Thunderbolt router support, fixes an HDMI display issue, and improves compatibility when using the 5GHz band in Wi-Fi.
You can get the updates by selecting Software Update from the Apple menu at the top left of your screen.