Yay! More fixes!
Originally posted on 9to5Mac:
This update addresses an issue which may cause a black screen to appear when installing Windows 7 or Windows 8 using Boot Camp Assistant if both an external optical drive and USB thumb drive are connected to the system. This update also ensures that the system will boot by default into OS X after installation of Windows 8.
Earlier this month, Apple issued a pair of updates that focus on fixing battery life bugs on both Airs and Retina MacBook Pros.