Calendar: Users with an active Google+ profile can add a Google+ Hangout to calendar events. Invited guests can join the hangout by clicking on “Join hangout” on the event details page. These hangouts will respect any restrictions in the administrator control panel.

The following features are intended for release to these domains on September 18th:
Spreadsheets: Users now have the ability to collaborate more efficiently with discussions in Google Spreadsheets. This updates brings features like the ability to +mention users to add them to the discussion.

Release track:
Scheduled

Editions included:
Google Apps, Google Apps for Business, Government and Education

For more information:
http://googleenterprise.blogspot.com/2012/08/bringing-google-to-work.html
http://support.google.com/calendar/bin/answer.py?hl=en&answer=2690797
http://googledocs.blogspot.com/2012/09/google-spreadsheets-now-with-discussions.html

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