lol..nice video, and nice star wars theme..lol. I dont really think you can compare joomla out of the box with dolphin just because its much more basic out of the box then dolphin is. I also think wordpress is great as far as blogger sites go, yet imo thats kind of where wordpress stops. It is easy to optimize and somewhat simple, but definitely not comparable as far as social networking softwares go.
And it is definitely good news to hear one more beta release before the rc is released. It see more gives us more of a difinitive time frame as far as how to plan out own site releases or upgrades.