Here is a hangouts on Air that was hosted by Ronnie Bincer and I was lucky enough to be an invited guest. In this video Ronnie walks through the new changes and some of the old ones that new comers may not be aware of.
Watch New Hangout Changes - Overview with Ronnie Bincer
Watch on youtube.com
I am sure there are more changes to come, so don't get to settled on how things look...YouTube and G+ are in a state of mass improvement.
Have you been using Hangouts or Hangouts on Air?