Before Apple has even publicly released Mac OS X 10.6.5 the company has sent out the first build of Mac OS X 10.6.6. Build 10J521 of Mac OS X 10.6.6 requires Mac OS X 10.6.5 pre-release to be installed.
The build which weighs in at a very small 3.7MB contains no known issues, no listed fixes and only one focus area:
- Contains developer support for fetching and renewing Mac App Store receipts. See "Validating App Store Receipts" for more details.