Release track:
Rapid release
Editions included:
Google Apps for Business, Education, and Government
For more information:
https://support.google.com/drive/answer/3323935
http://googledrive.blogspot.com/2014/01/a-new-activity-stream-in-drive-shows.html
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Over the next few days, you'll notice a new activity stream in Drive. When you open Drive, click the "Details and activity" button (ⓘ) on the top right corner and the activity stream will appear, showing you who has taken action on files and folders in My Drive. You'll see a rundown of what your team has been doing, such as editing and commenting on notes, adding a new spreadsheet, renaming a presentation, etc. If you select a specific file or folder, the stream will change to show you specific information about that item.Get these product update alerts by email
Live Updates from Google
A new activity stream in Drive shows you what's changed - January 15, 2014
Reach people you know more easily through Gmail and Google+ - January 13, 2014
Targeted legal holds in Google Vault - December 12, 2013