Screenshots of Windows 10 Build 10551 got leaked online. This build includes an updated Edge browser with couple of new features. First, it now allows users to sync their favorites and reading list across Windows devices.
Second, when you middle click the Edge icon from taskbar, Start menu or desktop icon, a new Edge Window will open. This is similar to the middle click feature. Microsoft is also bringing tab preview feature for Edge browser in the upcoming Windows 10 Build.