Sorry for the late response here but the answer to your question is not much. You'll of course want to ramp up in the usage features of Jive 6 (new UX, activity engine, etc) but for community management the game hasn't changed a lot. We still create groups and spaces the same, the overview pages still behave the same and we still have the same options for content management.
Hope this helps!
The info you gave me on our tel-con is the direction I'm driving for.