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The new build, identified as 10K521 by MacRumors, reportedly comes without any detail of changes.
Apple previously released 10.6.7 to the public nearly two months ago.
That update was delivered in two flavors, one specifically for Thunderbolt-equipped MacBook Pros identified as build 10J3250, and a general release for other models 10J869.
Mac OS X 10.7 Lion is anticipated to be released at Apple's Worldwide Developer Conference during the first week of June.