Apple has posted a new EFI Update for the 13-inch Retina MacBook Pro, which fixes issues that caused the built-in keyboard and trackpad to freeze up and stop functioning.
Apple recommends that all late 2013 13-inch Retina MacBook Pro owners install the update. The EFI update should be available through the Software Update tool in the Mac App Store for all users with an affected MacBook. Apple has also released an EFI update for the late 2013 15-inch Retina MacBook Pro.