Apple has just seeded OS X Lion 10.7.4 (Build 11E46) exclusively to the developers which addresses issues related to stock OS X apps like Mail, QuickTime, Time Machine etc. in addition to a bunch of bug fixes. Like always, the beta release is available only to registered Mac developers who download the latest update from the Developer Center. There is still no public release date for 10.7.4.
Here are the official release notes (via 9to5Mac):
OS X Lion 10.7.4 build 11E46 Seed Note
OS X Lion Update 10.7.4 is an update to OS X Lion 10.7.
The OS X Lion 10.7.4 Update (Combo) updates
– OS X Lion 10.7, 10.7.1 or 10.7.2, 10.7.3 GM or any other previous 10.7.4 seed builds.
The OS X Lion 10.7.4 Update (Delta) updates
– OS X Lion 10.7.3 GM or any other previous 10.7.4 seed builds.
Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary.
– App Store
– Screen Sharing
This build is being provided to you for testing and development purposes. Should you encounter any problems, please submit a bug report using the online Bug Reporter at <http://bugreporter.apple.com/>. Please make sure to include “10.7.4 (11E46)” in the bug title and description. This information will ensure that your bug is processed quickly.
When submitting a bug report, please make sure to include a Summary, Steps to Reproduce, Actual Results, Expected Results, the System Profile Report, and any other relevant information that is necessary to process the report.
OS X Mountain Lion (10.8.x) is expected to release sometime in the late summer