The latest Pantheon web farm update (release tag 2012-07-25b) includes:
3 core changes
fixes to 5 snippets
changes to 1 theme

The svn logs of these changes are:

[Pantheon][Core] Resolve menu path resolution for subsites with _notes folders in their menu folders.

[Pantheon][Core] Dont profile on test/live

[Pantheon][Themes][CCUSB] Initial assets for CCUSB theme.

[Pantheon][Themes][CCUSB] Initial files for CCUSB theme.

[Pantheon][Sample Site] Fix Regression in show-hide.html

[Pantheon][Snippets][QuickLinks] Initial commit

[Pantheon][core] Fix use-case which could cause an infinite loop

[Pantheon][Snippets][FormMailer] Fix FMUtil tokeniser when field names are partially re-used

[Pantheon][Snippets][FormMailer] Fix issue with radiobuttons requiring an extra trailing semi-colon, which departs from convention

[pantheon][ugprogrammes] – removed year from links in the ugprogrammes in line with changes to the url

[Pantheon][Themes][CCUSB] Updated background, added image javascript.

[Pantheon][Themes][CCUSB] Added more snippets.