If you want to run a bash shell under Windows 10, they now offer one
Unfortunately, that is not exactly true. That was my hope when I first heard about it, because cmd.exe is such an abomination. But in fact, the Bash shell seems to be in some sort of Linux virtual machine. It doesn't run Windows executables and knows nothing or very little of Windows. So it cannot be used to do useful Windows stuff.
If you hoped to be able to use Bash for Windows scripting, well, forget it. It's still either cmd.exe or the convoluted and Windows-only Power Shell.