Yep, last time I called a couple months back the guy running the show said Doctor Sleep will be pre-signed and there will be a one hour long signing after the Q&A. He seemed pretty confident about the info.
edited for additional information:
http://pencanada.ca/news/stephen-kin...anada-benefit/
Scroll down to comments and you'll see a reply from Brendan. He's the event organizer.