[Note: This report is a tiny bit spoilerish, describing both the identity of the prologue character but also the identity of which POV has the first chapter in the book, a detail we have not previously had. If you're interested in reading full reports and speculation on the prologue, visit this thread on the A Song of Ice and Fire forum.]
http://13depository.blogspot.com/2010/09/world-con-2010-days-2-and-3.html