"a collaboration with Docker to enable the same tools to manage containers on both Windows and Linux."
If I understand this correctly, it's just that you can use Docker management tools on Windows, not that you can run any of the actual standard Docker container packages. I suppose that makes sense, as Microsoft hasn't done anything that would enable the actual containerised packages run on Windows.
So, it remains to be seen how many people will bother to make, test, and debug container packages for Windows Server as well as for Linux.