[German]Microsoft indirectly confirmed (probably last month) that the new build of Windows 10, which is being developed under the code name Redstone 4, will be released in April 2018 as version 1803.
I've noticed a tweet from Tero Alhonen (@teroalhonen), mentions a life cycle diagram of Windows 10 versions.
Another Windows 10 version overview https://t.co/3cVWkdYlNF
Windows 10 Version 1803 Release To Mary Jo Build 17115 pic.twitter.com/CohYLE3M3r
— Tero Alhonen (@teroalhonen) 13. März 2018
It seems, that Microsoft has published the post Another Windows 10 version overview within the developers blog (Red Pill Blog) on February 24, 2018. The published table indicates that Windows 10 version 1511 will be dropped from support on April 10,2018. It is also announced Windows 10 version 1803 (probably named Spring Creators Update), which is currently only available as a preview, will be generally released in April 2018. And in October 2019, support will end for this branch again.