Release track:
Scheduled Release
Editions included:
Google Apps for Business, Education, and Government
For more information:
http://googleenterprise.blogspot.com/2013/11/calendar-events-that-update-when-google.html
https://support.google.com/a/answer/172013
whatsnew.googleapps.com
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5 million businesses and growing
Starting today when Google Calendar invitations are sent to members of a Google Group, the attendee list will automatically update as people join or leave the group. When you join a Google Group, you will be added to all of its meetings. And if you leave a group, those meetings will be removed from your calendar. Note that groups stop dynamically changing when the total number of guests in the event crosses 200.
Live Updates from Google
Scheduled Release: View and save Gmail attachment directly with Drive - December 04, 2013
New sign-in page for Google Apps customers (coming next year) - November 26, 2013
Scheduled Release: Calendar events that update when Google Groups change - December 03, 2013