On Windows 10, using PowerShell 5.0.10586.494 the New-ModuleManifest cmdlet just returns after prompting for the file path. This goes against the documentation.
How to Write a Module Manifest
https://msdn.microsoft.com/en-us/library/dd878297(v=vs.85).aspx
That's seemingly how it works these days. You just edit the created manifest by hand thereafter.