
Apple has issued a new update for Mountain Lion Developer Preview 4 via the Mac App Store. It was first noticed by Twitter user @Lhunar and introduces the new Mountain Lion Security Update system.
The new system does daily checks for security updates as Apple ramps up its security protocols in the next-generation operating system. Earlier this month, it was noticed that Apple had changed the language on its OS X marketing pages following the Flashback malware attack earlier this year.
The new security system in Mountain Lion -- including Gatekeeper and other features -- appears to be a significant expansion of the XProtect system that Apple has used in the past to try to thwart OS X malware.

The update weighs in at 1.16GB and is available to developers with Mountain Lion DP4 installed via the Mac App Store.OS X Security Update Test 1.0 -- Restart Required
This update tests the new Mountain Lion Security Updates system. The new system includes:
- Daily Checks for required security updates
- The ability to install required security updates automatically or after restarting your Mac
- A more secure connection to Apple's update servers.
This update includes general updates and improvements to Mountain Lion Developer Preview 4.
Article Link: Apple Updates Mountain Lion Developer Preview With New Security Features