The actual signing was weeks ago, and I was wondering why no one had created this forum (although, 2 other authors were there, so maybe that influenced that decision.
Anyway, the only reason I made this is because of the questions I had asked him then; if you have any more material regarding this signing, I think someone would appreciate it being added, but I digress.
I asked 2 questions which got answers
1) Q: Could wax, vin, or TLR burn nightblood?
A: (paraphrased) Firstly, you're assuming Nightblood is not allomantically inert (he didnt say if it was or not), but if it was, it would be like trying to burn someone else's metalmind.
2) Q: Could you tell me anything about the other (Dysian) Aimians?
A: (paraphrased) You'll be surprised when you see them, they're barely humanoid.
hope you find this useful, and if you dont think these are credible, you're welcome to ask him these questions next time you see him, and if you get a different answer, I will accept being wrong.