Warner Bros gave exhibitors a sneak peek at Gravity at CinemaCon but this is the first trailer for the space pic starring Sandra Bullock and George Clooney in the two-hander about astronauts stranded in space after their space shuttle gets demolished during a spacewalk. The Alfonso Cuaron-directed movie will be released wide October 4 in 3D and IMAX after the studio pushed it back from its original November 2012 spot.