We have earlier reported that Windows 10 Mobile Redstone 3 may have more focus on Mobile version of Windows 10. Now, tweets from a well-known Microsoft enthusiast claim two new features / changes coming as a part of Windows 10 Mobile Redstone 3.
https://twitter.com/vitorgrs/status/828548301305815040
https://twitter.com/vitorgrs/status/828549354881441792
Microsoft may be planning to bring Surface branded Mobile devices running Redstone 3 by end of 2017. It may however very well be the early part of 2018 too before we see a Surface Mobile device.