Following the release of OS X 10.8.2 earlier today, Apple has pushed out a new EFI firmware update for the Retina MacBook Pro (via MacRumors). The update is recommended for all Retina MacBook Pro users, and fixes a number of fixes and improvements.
This update is recommended to MacBook Pro with Retina display (mid 2012) models. This update resolves an issue which can cause the system to hang during heavy processor loads, and resolves an issue where NetBoot does not function properly when using an Ethernet adapter.
The update will appear in Software Update after OS X 10.8.2 is installed, and should performance issues that have been affecting some users.