5 million businesses and growing
Vault admins have had the ability to put an entire user account on hold to preserve messages in that account. Next week we will roll out a new feature that will allow admins to also have the option to target specific messages-for example, by date or with certain terms-for indefinite preservation in Vault.
Editions included:
Google Apps for Business, Education, and Government
For more information:
https://support.google.com/vault/answer/4409170
https://support.google.com/vault/answer/4409174whatsnew.googleapps.com
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Live Updates from Google 

Targeted legal holds in Google Vault - December 12, 2013
Update to Device management setting in the Admin console - December 05, 2013
Scheduled Release: View and save Gmail attachment directly with Drive - December 04, 2013