It was previously let loose by Karen Miller that novels #4 and #5 of The Clone Wars series will be a duology containing a cliff hanger bridge between the two books. NJOE.com reports that Stealth will be the title for the fourth TCW installment, while Gambit will be the overall duology title.
The Clone Wars: Gambit: Stealth, by Karen Miller, is currently set for a February 2010 release.
We'll keep you posted as we hear more, especially if it's in the form of a formal announcement.
UPDATE: The title of TCW novel #4 by Karen Miller has been confirmed as Star Wars: The Clone Wars: Gambit: Stealth on the Random House site. Look for the novel (which is part one of a duology) to hit bookstores on February 23, 2010.