Does it work? Sure it does, is it supported? – No way In my test I deployed the new Windows Server Technical Preview 9841, installed the distribution point, management point and software update point requirements.
Here you see the distmgr.log file distributing content to my cm03.corp.viamonstra.com distribution point – notice the server version number.
Windows 10 client downloading from the Server vNext distribution point
Management Point works like a charm
Application Catalog point running from a Windows 10 client
Software update point configured as the second SUP works. The SUP is installed using the same shared database as my Windows 2012 R2 WSUS server and it’s working like a charm.