Serena and Blair: The most fabulous, trendsetting serial killers

From PW:

Von Ziegasar Goes 'Psycho'
Cindy Eagan, at Little, Brown Books for Young Readers, bought North American rights to a reimagining of Gossip Girl by the series creator, Cecily von Ziegasar. Sara Shandler at Alloy Entertainment brokered the deal, and the book, Gossip Girl, Psycho Killer, will riff on the original title that launched the popular YA line about a group of wealthy Upper East Side teenagers who attend a posh Manhattan private school. The book, which will be a mashup in the style of Pride and Prejudice and Zombies, is, as a rep at LBYR put it, "a serial killer version of the original Gossip Girl novel... or, put another way, ‘Gossip Girl: Slasher Edition.' " In Psycho Killer Blair Waldorf and Serena van der Woodsen—the two central characters of the series—become the "most fabulous, trendsetting serial killers" around. The title, which will be released under LBYR's Poppy imprint, is scheduled for October 2011.

Sounds interesting...