WIN10 is moving to a more standardized features release pattern in the future, targeting two releases per year (September & March) as described below

https://blogs.windows.com/business/2017/04/20/windows-office-align-feature-release-schedules-benefit-customers/#w4YESfku4SOhItFV.97

A key part of that economic impact is staying current with Windows 10 with feature and security updates. This approach has made large-scale, costly wipe-and-replace Windows deployments every few years a thing of the past. We’ve also heard our customers want more predictability and simplicity from this update servicing model to help make deployments and updates of Microsoft products easier.  Here are more details:

* Windows is committing to a predictable twice-per-year feature release schedule, targeting September and March of each year, aligning with Office 365 ProPlus. The next Windows 10 feature update will be targeted for September 2017.

* Each Windows 10 feature release will be serviced and supported for 18 months. This is consistent with our current Windows 10 approach, but adds further clarity and predictability to organizations by aligning with Office 365 ProPlus.

* In addition, System Center Configuration Manager will support this new aligned update model for Office 365 ProPlus and Windows 10, making both easier to deploy and keep up to date.