The Summer 2015 release of the LSST stack is internally numbered "11.0" (git tag) or v11_0 (EUPS distrib).
These release notes document notable changes since 10.1, which was the Winter 2015 release.
Big Important thing
The following fixes resolve problems visible to end users.
These improvements should not usually be visible to end users. They may be important for developers, however.
These release notes focus on the Science Pipelines part of the LSST Stack, but there are other important components developed by Data Management teams.
An up-to-date list of known issues for 11.0 affecting external users is available.
A summary of Stack characterisation measurements is available.