Jonas Brothers and Demi Lovato return to camp and face off against new rivals.By James Dinh The Jonas Brothers at the "Camp Rock 2" premiere Photo: Andrew H. Walker/ Getty Images Before the summer ends, the Jonas Brothers and Demi Lovato will return to the wilderness one more time in "Camp Rock 2: The Final Jam." While on "Good Morning America" and on tour, they've teased fans with new songs from the movie's soundtrack.