Dropbox makes some announcements about Dropbox for Business, but not the one I’m waiting for

Dropbox announced new administrative capabilities in the company’s enterprise offering, Dropbox for Business. These include the following:

  • View-only permissions for shared folders — users will be able to designate who can view or edit files in shared folders. Formerly, access to a folder always included the ability to edit files.
  • Passwords and expirations for shared links — users will get added controls on shared links, making them more secure.

Here’s the screenshot of the settings for shared links:
passwords__expirations_for_shared_links
These capabilities are available in an early access program. Administrators of Dropbox for Business can turn the features on.
Dropbox also announced that full text search of files within Dropbox is coming in the ‘next few months’, and mentioned that documents previews were improved recently.
While they discussed the collaboration experiment, Project Harmony (see Dropbox Project Harmony is breaking the rules), there was no mention of true activity streams in Dropbox, despite acquiring Zulip (see Dropbox acquires Zulip, readies two-headed client) and Droptalk (see Dropbox acquires MobileSpan and Droptalk: It’s going to be a busy year). That’s the contextual conversation capability that will set Dropbox apart.
Where is it?