Apple will soon be distributing Mountain Lion 10.8.2 for beta testing. 

Participants in Apple's AppleSeed program have received alerts that they are “invited to participate in the next Mountain Lion Software Update seed project, 10.8.2.”  

See also: Apple's iOS 6 release date, rumours, and leaked images

9to5Mac surmises that this update is likely to offer iOS 6 compatibility and features.  

Beta testers of the Mountain Lion OS X 10.8.1 update have revealed that it improves battery life for Apple’s laptops. That update is expected to be available to Mac users soon. 

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Related: 

Immanent Mountain Lion update will fix battery life issues

Second OS X Mountain Lion 10.8.1 beta released to developers