Hello all, last night a few friends and I had the good fortune to go to our first book signing with Brandon Sanderson in Houston. Between the three of us we managed to ask 9 questions about Stormlight (though we didn't get as many answers), and I asked one about the end of AMoL that was inconsequential to the story except for the character it involves, so be forewarned. Brandons responses will be paraphrased for the most part.
Edited and added the fifth question my friend asked. That explains how Lopen's arm could heal from Stormlight but Kaladin's slave scars haven't ever healed.