For those on the Fast Ring of Windows 10 Insiders, build 14971 is now available. EPUB is now supported in Microsoft Edge, which will be nice.
PowerShell in the Shell: In an effort to bring the best command line experiences to the forefront for all power users, PowerShell is now the defacto command shell from File Explorer. It replaces Command Prompt (aka, “cmd.exe”) in the WIN + X menu, in File Explorer’s File menu, and in the context menu that appears when you shift-right-click the whitespace in File Explorer. Typing “cmd” (or “powershell”) in File Explorer’s address bar will remain a quick way to launch the command shell at that location. For those who prefer to use Command Prompt, you can opt out of the WIN + X change by opening Settings > Personalization > Taskbar, and turning “Replace Command Prompt with Windows PowerShell in the menu when I right-click the Start button or press Windows key+X” to “Off”.