Well they are very interesting if I do say so myself. I think the cast as a whole is a little bit more animated when she is around. If you get a chance you should definitely watch. There is a pre-screening video from season 2 where the gang is all talking and laughing and Jim, as well as everyone else is having a great time. In a interview with Taraji she said that she and Jim sing old New Edition songs in between takes. She really brings out the best in people from what I have seen!
Because Carter wasn't there. Though he is mostly quiet during these press conferences, I've noticed that he said even less during this one. When Taraji with the group she will say things like call Jim Jesus and he will laugh and be more animated with the group.
I would say yes. Haven't you seen prior Comic Cons and the jokes that were said. I've seen evidence of this is NY Comic Con and SD Comic Con last year.