Microsoft has “confirmed” that the next version of Windows 10, version 1803, a.k.a. the Spring Creators Update, will be available in April 2018. This info came by way of this blog post, in which Microsoft originally listed the release as “April 2018”, and then removed the mention shortly after.
Assuming all else goes to plan, Microsoft is expected to finalize the next Windows 10 update in the coming two weeks, and release it to consumers a couple more weeks later. The update will feature more Fluent Design changes to the system, and new tentpole features such as Timeline (a new way to resume past activities you started on this PC, other Windows PCs, and iOS/Android devices), and better DPI support.