Posted this already in the Stormlight form, but I asked Brandon 2 serious questions and one silly one.
First was for my copy of Edgedancer: "Tell me something I wouldn't know about Lift"
Answer: "She sometimes doesn't like Foods, but not all of them"
Second: "Question about the Shin. Are the Shin originally from Roshar?"
Answer: RAFO (First Card yay!)
Third: "Tangentially related to that, does the Shin obsession/valuing of Stone/Metal have anything to do with Scadrial?"
Answer: "Yes. Oathbringer gets you closer to finding out more about the Shin, but still a bit of a way out."
Overall, I think that definitely opens a bit of a can of worms, but so glad I got to chat with him again. Also general pro-tip (I didn't see it specifically called out in the yes/no thing or missed it), keep questions and things in books to very specific things. He will not answer "Tell me who is a worldhopper" or anything that vague.