We're three weeks away from the release of Ghosts of Ascalon, and fans are alternately excited and a tad concerned. We know that there will be three Guild Wars novels before Guild Wars 2 is released, so they're serving as sort of a timeline.
Curiosity about when the next one will arrive may have been satisfied a bit by an update to several sites yesterday: publisher Simon and Schuster, and two major bookstore sites. Simon and Schuster shows an unnamed book set for release on December 28th of this year. That in itself is a fairly useless piece of news until it's combined with the Borders placeholder that gives the same date and calls the book "Untitled Guild Wars," as does the Barnes & Noble site.
While nothing is confirmed as of this writing, the two site updates together provide a potentially exciting piece of information.