Two days after upgrading to MacBooks Air, Apple has just released the MacBook Pro Retina SMC Update 1.0 also enabling the Mountain Lion's Power Nap feature on their latest professional laptops, as well as fixing hibernation / stability issues. The update requires OS X 10.7.4 or higher and is recommended for all users. (Apple)
Update
The reader Ruben Dias already installed the update on your MBP and sent us a screenshot showing the active option in System Preferences: