For Domains with ‘enable pre-release features’ checkbox disabled in the Administrator Control Panel:

The following features are intended for release to these domains on February 22:

– Visible Bcc: Gmail will now provide email recipients an indicator when they are added via Bcc on an email. We will add a visible Bcc header only to messages sent from another Gmail user, not from external sources. Each Bcc recipient will only see themselves on the Bcc list.

– PDF attachments showing the ‘View’ link open with Chrome’s native PDF viewer if available.

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

Languages included:
All languages supported by Gmail