From Publishers Marketplace:

Angie Smibert’s THE MEME PLAGUE, the last title in the MEMENTO NORA trilogy, wherein a group of teens fight to expose the truth about the city’s mandatory ID program and the ID chips’ ability to implant false memories, to Marilyn Brigham at Marshall Cavendish, by Tina Wexler at ICM (World).

Book 3 should come out in Spring 2013. Now, I just gotta finish writing it!