SHADE to be a trilogy!
Simon Pulse has bought a third book in the Shade series, plus one additional teen-fiction book from Jeri. SHADE #3 will be published Summer 2012 (tentatively May) and its title will be announced closer to the May 3 release date of Book 2, Shift. Jeri's first post-SHADE YA book will be published Fall 2013. See Jeri's blog post for more details.