But only when it's running 10.11, is that correct? No support on any currently released version of OS X, even 10.10 ?

> Correct is an El Crappy situation for users running old OS...

OS X v10.11 Developer Beta supports the following Macs:

iMac (Mid 2007 or newer)
MacBook Air (Late 2008 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
Mac mini (Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
Mac Pro (Early 2008 or newer)
Xserve (Early 2009)