The Redmond giant officially stated this in their blog post.

Windows 10, version 1607 is our third Windows 10 feature update released. Based on feedback from organizations moving to Windows 10, this will be our last feature update for 2016, with two additional feature updates expected in 2017.
This means Microsoft is planning the next feature update in early 2017. It is codenamed "Redstone 2". The second major update is also scheduled for 2017. It is codenamed "Redstone 3".

Read more:
https://winaero.com/blog/windows-10-r...rrive-in-2017/