As you've probably heard by now, Windows 10 is what Microsoft claims to be the last operating system, meaning that ,instead of waiting several years to release a ton of exciting new features, Windows 10 is periodically updated, bringing new features to the end user on a much more consistent basis. To date, the two biggest updates have been the Windows Anniversary Update and the Creator's Edition Update. The third alleged update will likely be coming in the first half of 2017 and is being mentioned around the web under the alias "Project NEON."
The update features a slight but noticeable tweak to the overall aesthetic, as witnessed in the above leak featuring the Groove Music player. This is the only proof we have now of what's to come, but hopefully more leaks will surface in the coming weeks.