Last week Kristen kinda confirmed it in an interview and now toxicshocktv claims :
Even though Twilight isn’t due to hit screens until November, its production company, Summit Entertainment, has announced its moving ahead with the making of its sequel. Nikki Finke of Deadline Hollywood Daily said Monday that the sequel will be based on the book series’ sequel, written by Stephenie Meyer, called New Moon.
They'd better have a lot of Rob in it. And by the rate his fan base has grown I'm sure they will. So YAY for New Moon!