TheOneKEA
(paraphrased)
I asked him if it was possible to enter or exit Shadesmar in interplanetary space.
Brandon Sanderson
(paraphrased)
He laughed nervously for several seconds with a look that suggested "Uh-oh!" and replied (as best as I can remember):
I would say no. The Cognitive Realm does exist there, but Shadesmar is a special case.
TheOneKEA
(paraphrased)
I also referenced the recent Q&A and this post, and speculated that the reason why the original poster thought Wax's sister was a duralumin ferring was because of Wax's comment that he did not feel any strong emotions as a result of her death. I told Brandon that the poster must have thought that she was deliberately suppressing her Connection with Wax by using Feruchemy. I said that I didn't need a yes or no answer from him.
Brandon Sanderson
(paraphrased)
He replied that he would neither confirm nor deny my statement and would only agree that it was very interesting.
BlairJ
(paraphrased)
I did ask about Mistborn: Birthright.
Brandon Sanderson
(paraphrased)
Apparently it is going to make it's way to the next generation of consoles, so it should be a very nice representation. I did find out that Brandon is still writing 100% of the dialogue (there were some rumors a while back that he wouldn't be) and that it is well underway.
Green Fire
(paraphrased)
If Hoid would be printed as an MtG card, what would be his color and converted mana cost?
Brandon Sanderson
(paraphrased)
Brandon said he would be a "Straight Blue Planswalker" and "expensive" "probably 7 to 9 mana 4-6 colorless UUU"