Here's a bit of info from the signing yesterday (I don't know how much of it you guys know since I'm too lazy to go looking)
Silence devine: It's set in the same solar system as another shard, so there are ten shard systems (I swear he said ten). He also said that Stormlight, MB, and a third one (My brain is saying white sands, but don't quote me on that one. [edit]Now I'm also thinking it might have been Elantris. It was one of the two.) are three of the major pieces of the cosmology. WB isn't exactly important, but isn't unimportant either.
He also explained a bit about Realmatic theory. (spell check on rulmatic?) He said each thing exsists on three planes: spirit, mental, physical. So the way hulmargy (I'm too lazy to look up the proper spelling) uses the spike to rip off a piece of the person's spirit and create a hack (his word, not mine. I would more say link) between the two. He also said that metal isn't what creates the power, but is the link to the power, allowing you to access the abilities. He said that the Aon's in Elantris (we really, really need an abrevation for that book) is the same opening. Awakening however is putting your mental ability and life into an object.
The example given is a rock: it has the three "DNA" process -- it's "DNA" exsists on the mental, spiritual, and physical level. However, it doesn't have much by way of mental.
He also meantioned the pool, and when I asked, he did confirm that there is a pool in all three of the seen shard worlds (Elantris pool, the well as a pool, and he didn't say what the WB pool was.) When I asked if those were hoid's portals he didn't say anything. (Actually, I think he just said "I'm not going to answer that.")
I'll add more if I remember more, and I'll get off my lazy butt and catch myself up so I can ask better questions.
(Also, side note: He said that Realmatic theory is that each person is reborn three times. He then went on to explain the three planes of exsistance, but I don't know if the fact that he used "reborn" (or was it reincarnated) is important. Just food for thought.
Another note is that Realmatic theory is called that because that's what it's called in... my brain is saying dragonsteel, but I could be wrong. It's in one of the books.
I've also put this here, since Brandon meantioned them one after the other, and seemed to imply they're connected.)