Did Apple drop the keyword 'Server' from the Mac Mini category?
They haven't announced a Server version, it may come later.
Only Apple can know that.

The 'Server' version was not the same as the regular version, it had 2 HDs, no optical drive &amp; had OS X Server installed, rather than the desktop OS.

From EveryMac


  For all practical purposes, the "Server" configuration is identical to its non-server contemporary, but ships with dual hard drives and a pre-installed copy of OS X Server for Mountain Lion.