The latest Pantheon web farm update (release tag 2012-08-07a) includes:
2 core changes
fixes to 2 snippets
changes to 3 themes

The svn logs of these changes are:

• [Pantheon][Snippets][Chronos] CSS fixes for news-content snippet
• [Pantheon][Themes][Chronos-SAC] Fix SAC flavour menu
• [Pantheon][Themes][CCUSB] Additional CSS fixed, added missing files
• [Pantheon][Engine] Fix intermittent issue with PostProcessing
• [Pantheon][Components][Summary3] Sign Off meeting fixes and FeedComponent module for future use
• [pantheon][ugprogrammes] – removed year from urls in UG programmes listings and the search box
• [Pantheon][Sample Site] Backports and fixes

The Castor branch has now been updated with some security fixes, and is now at version 2012-08-07castor.