Hello,
I am not sure what is going to happen if you upgrade to Windows 10. I expect the up coming release of VC 2.3 to be supported on Windows 10, but as far as I know the current version 2.2 Update 2 has not been tested on Windows 10. I could be wrong, but I will get a confirmation.
As for Visual COBOL for Visual Studio 2015, this will be available in version 2.3.