Microsoft has today made available the public preview for the first time



From Windows Central:

Office 2016 marks a major shift in the desktop experience, as Microsoft is bringing some of its online based features right in such as real-time collaboration. Previously this was possible through use of Office Online, but with Office 2016 there's no need.

That is but one of the many new offerings inside Office 2016, so if you're interested, testing it out is really easy. Head on over to the Office 2016 preview page and simply follow the instructions.

  Microsoft makes Office 2016 available as a public preview