Microsoft is currently working on introducing a new Design Language codenamed Project NEON for its users on Windows 10 and Windows 10 Mobile. The company has plans to roll out the New Design Language with Redstone 3 which is scheduled to arrive in late 2017.
Our friends at Windows Central have been reporting that the company is working on the new Project NEON for more than a year now internally. Project NEON will basically focus on fixing inconsistencies found on Windows 10 apps including Microsoft apps. The Project NEON will provide developers with clear guidelines during the designing of their apps.
The company is having plans to unify the operating systems across devices including Hololens with the Release of Redstone 3 Windows 10. As reported Windows 10 Redstone 3 is expected to arrive around mid or end of 2017, but the insiders on Fast ring will be able to have  an early access to Microsoft’s Project NEON after the release of Creators Update ala Redstone 2 around March 2017.
