MacRumors posted a story that Apple has released OS X 10.7.5

The update includes a number of enhancements, including the activation of the Gatekeeper feature from OS X Mountain Lion that allows users to limit for security reasons what types of apps can be installed on the user's computer. The feature has been present in OS X Lion since OS X 10.7.3, but has been hidden from the public.The 10.7.5 update is recommended for all OS X Lion users and includes general operating system fixes that improve the stability, compatibility and security of your Mac. It also includes Gatekeeper, a new security feature that helps you keep your Mac safe from malicious software by giving you more control over what apps are installed on your Mac.

  Apple Releases OS X 10.7.5 with Gatekeeper