He answered both questions already so you will just get a variant of his previous answers.
It's funny because people generally ask the same questions every single time, wasting time for those of us who want new info. Originally, I thought they were doing it because it's just a common question, but it happens way too often to be mere coincidence. Rather, I think that there are some fans who just want to hear the same story in person.
I don't blame them. I'd kill to have Jim tell me his witch doctor story in person.
Not everyone has been reading these stories since 200_ (fill in the blank). For example, I loaned someone at work Storm Front about a year and a half ago, she started buying the books and just finished Changes a couple months back and is now reading Side Jobs. People in that situation don't know why the stories are set in Chicago, usually don't know about this forum and haven't watched YouTube videos of Jim answering questions at other Cons.
There was a time if you went to a Science Fiction or Fantasy convention you were pretty much considered to be an expert and or fanatic about certain movies, TV series, books or comics. This assumption was usually true. Today these Cons have become a big business and promotional tool and there are so many of them they allow many more casual fans to see their favorite actors, directors, authors and other creative talents. So yes, while it has and will continue to be tedious to listen to some (maybe many) questions that everyone here knows the answers to, know that most people who attend the Q&A's with Jim aren't as knowledgeable about the Dresden Files as you are.
The real reason we are currently going over a finite number of topics is a factor of the time between books and to a lesser degree where we are in the overall story. If Peace Talks had come out January of this year we would certainly have new topics to discuss. Also, I think the structure of the last two books has contributed to the lack of new topics. Cold Days was a disarm the bomb in X amount of time story. I think I could compare CD to the movie Speed. We didn't learn about Keanu Reeves childhood, he didn't bond with the bad guy like in Point Break and he didn't start dating anyone. It's was just non-stop action and fun. Being a novel Cold Days did give us some personal drama, but it's was as if the rest of the outside world had been put on hold. Lara was getting more dangerous but we didn't see her, Marcone was off somewhere; no that was Ghost Story, but he's not in CD and the White Council had their own problems and weren't in Chicago. Even the new bad guys; the Fomor, weren't a factor in this story. We did get a big new development at the end with Molly becoming the new Winter Lady and Harry was forced to stay on the island, but we were left wondering what it meant as well as what would happen next. Skin Game continued the same pattern as Cold Days. Harry was handed this seemingly impossible task and only through clever negotiating was he able to bring along one person to help him with it. Fortunately, we got some knew interesting characters and old favorites to interact with Harry, but until the scene with Marcone and Mab, once again the rest of the world was put on hold. One more thing to note about both CD and SG; as far interpersonal relationships go, they both featured continuing tension in the relationship between Harry Dresden and Karrin Murphy. That isn't necessarily a bad thing; though many might disagree with me, but it's not really something new and different. People have been talking about Murphy and the Harry/Murphy ship for a long time.
I think once the story arc rejoins the rest of the Dresden verse it will open up many new avenues of discussion. Plus, I suspect there will be more reveals about issues that have been simmering for a long time. This isn't a knock against Cold Days or Skin Game, it's just the way things have played out.