Ubuntu’s Jorge Castro has just tweeted that the Unity/Compiz pre-alpha is now available for early Natty users to test via PPA.
More information can be found @ http://bit.ly/donNSi and the PPA ityself – whic is Natty only – can be found @ launchpad.net/~unity/+archive/ppa/
A PPA for Maverick users aims to be available ‘next weekish’.
P.S. I’m still calling this Compinity in my head ;)