Of course, Robert Downey Jr. is at center stage and leading the way on this press conference. I believe everything in here has been covered but it is interesting to see the cast and crew's interactions with each other. The biggest question is: Did our own Brent Sprecher really embarrass himself? I didn't think so but you can check for yourself at 17:07 of the video. The whole clip is almost 27 minutes long but it is very entertaining.
They do talk about the movie's plot and specific scenes since the entire room of press people had just seen the film the night before.