As a huge fan of Graceling, I was excited to see the announcement that the sequel, Bitterblue, is scheduled to be published in May, 2012. If you haven't yet read Graceling, and you enjoy fast-paced action/adventure stories featuring a strong female character (along the lines of Hunger Games), I'd highly recommend it (see past review for more info.)
Just FYI, even though Fire was published AFTER Graceling, it is actually a prequel, so Bitterblue will be the first book to continue on the exciting plotline of Graceling.