two weeks ago i implemented WSUS windows server 2012 R2 at my customer.
after finish process installation, windows 10 on WSUS server show as windows vista.
then i research and after read this article https://support.microsoft.com/en-us/kb/3095113 i can solve this problem.
“This update also fixes an issue in which Windows 10-based computers are displayed as “Windows Vista” on Windows Server 2012 R2 or Windows Server 2012″
you need to install update from microsoft.
after install update, you can solve the problem.