Would assume private beta is under NDA...if so, have to wait for public beta to hear/see much.
I know most traditional Server users are frustrated/surprised/mad about Apple killing off features (interfaces to features), but I haven't used or been around orgs using Server for anything beyond Profile Manager, NetInstall, File Sharing, and the handy certs tool....for years.
I am in the minority not really caring that they are killing off most of the network tools, as there have been better options (IMHO) for years. Have already moved on, long ago.
I am more interested to see what becomes of Profile Manager and NetBoot/NetInstall, as a low cost MDM option. If they go away, lots of folks will be looking for a way to replace, and commercial options are (mostly) pricey, while open source are typically more technically challenging to setup and run. If/when Apple's basic MDM tools go away, it will leave a pretty good size hole between the two ends: roll-your-own and commercial.