Tim Tetrick blogged about the announcement made public about Office 2016 availability on September 22nd.
I was excited to see the official announcement yesterday that Office 2016 will be available starting on September 22nd. Another interesting announcement was the improvements that we are making to the Office update model.
Consistent with the Windows 10 approach, we are seeing a similar Current Branch and Current Branch for Business model for the Office desktop client in Office 365.
Read more at source: http://blogs.technet.com/b/uspartner_ts2team/archive/2015/09/11/office-2016-release-date-and-new-office-servicing-options-announced.aspx