The audition information for Eclipse is online. Eclipse and New Moon will be filmed back to back and go all the way until Eclipse is done. Filming is set to begin in March 2009.
Summit Entertainment has started preparing the sequel New Moon, based on Stephenie Meyer’s second book in the series, and to contain costs, the studio is filming the third book, Eclipse, back to back using the same new director. On Sunday, December 7th, Summit Entertainment confirmed that Catherine Hardwicke will not direct the films New Moon or Eclipse. Filming begins on New Moon in March, 2009, and will continue right through completion of Eclipse.
You can see the audition information here.