Eddie of Star Wars Chronology spotted a Legacy Era Campaign Guide on Amazon. It has a release date of March 2009 and lists Star Wars RPG regulars Rodney Thompson, Sterling Hershey, and Gary Astleford as authors. (Perusing their listings also turns up campaign guides for The Clone Wars and The Force Unleashed.)
Remember, Amazon is not exactly a reliable news source, so we can’t be 100% sure of this… But seeing as they’re doing a KOTOR guide I don’t doubt they’re up for detailing other EU eras.