Watched almost everything - I'm personally excited for the new messaging system, as he points out, you could get your messages with SMS, iPhone/iPad notifications, Facebook notifications, etc. As one of the users of YouTube pointed out, Google already tried to make a new messaging system from scratch called Google Wave, I hope Facebook succeeds.
I didn't understand THAT much of what I was hoping, but I did get some parts, such as how People are interested in People, it's just something psychological.
Facebook will continue revolutionizing Social Networking IMO. Let's hope the new messaging system is a success.