Anyone interested in science-fiction for teens should read this article--The Campaign for Shiny Futures, by Farah Mendlesohn, published (and available online here) in this month's Horn Book.
After reading this, I began to wonder what science-fiction books marketed for teens are out, or coming out, in 2009? Mendlesohn's bibliography includes one 2009 title-- Before the Storm, by Sean McMullen. I'm reading one right now-- The Rule of Clawby John Brindley. There's another Softwire book coming in April--The Softwire: Worm Hole Pirates on Orbis 3 (wild space adventure for middle grade kids and younger teens), and coming in May, there's Hunger: A Gone Novel. There's also the new Hitchhicker's Guide to the Galaxy book, which Eoin Colfer is writing -- And Another Thing...
This is all I came up with after some brisk googling, and it's a pretty paltry list compared with the riches of forthcoming fantasy.
Trisha came up with a few others: Patrick Ness' The Ask and the Answer, sequel to The Knife of Never Letting Go, Scott Westerfeld's Leviathan, and Kenneth Oppel's Starclimber. It still seems an awfully short list...it is no wonder the Norton Award is so heavily weighted in favor of fantasy (see post above).
And I've added two more that sound more sci fi than fantasy, both by debut authors and both coming this fall--Teri Hall's The Line and Pam Bachorz's Candor.
That makes ten.