I've been saying here and on my website that normal book limits apply--that is, I'll sign three books (one personalized and two just signatures). You can also bring books from home or purchase them on-site. I just heard today, however, that the con is capping how many books you can bring from home. According to what I heard, you can only bring two books (per author) from home into the book fair. The rest have to be purchased. I hadn't heard this until now, and I apologize for the last minute news. To my knowledge, there have been no limits in previous years, so this is new to me if it's true. So, I'll still sign three if you bring two and buy one (or some other combination), but just be advised of this if you were planning on bringing them all from home. And if you've got someone with you, they should be able to bring in two books for you as well.
Hope that makes sense, and again, I apologize for any confusion. The rest of the details about the book signing are on my website, so check there for any other questions about signings. Looking forward to seeing you guys there!