In a recent blog post, Microsoft's Nathan Mercer reveals Windows 10 Anniversary Update will be the last feature update for 2016. More interestingly, he adds that Microsoft is planning to launch two feature updates in 2017.
Today’s release of Windows 10, version 1607 is initially considered the Current Branch (CB) and will become Current Branch for Business (CBB) in about four months from today. For a list of Windows 10 versions by servicing option, see Windows 10 release information. For more information about these servicing options, see Windows 10 servicing options for updates and upgrades. 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.
Microsoft doesn't reveal details but according to the rumor mill the first update will be Redstone 2, this will be the more significant feature update and it's expected to coincide with the arrival of the new Surface Pro and Surface Book devices. The former is expected before springtime while Redstone 3 is slated for later in 2017.