You can checks the new features of WSL on Windows 10 version 1803 from the Microsoft blog as following:
Windows Command Line Tools For Developers
Personally, the important change is following:
Chmod/Chown WSL Improvements
From the new version of WSL, you can use chown/chmod commands when you mount local filesystem with metadata option. but there are some limitations.
Inversely, if I have a file in WSL which states its Linux permissions allows writing--but I've disabled write permissions in Windows--I still won't be able to perform actions. Windows permissions for a file or folder will trump the permissions set under WSL.