Though studios remain optimistic about the continued enthusiasm of moviegoers to shell out extra money to see films in the 3D or IMAX format, they will still proceed cautiously with a new tech innovation presenting movies at a rapid-fire 48 frames per second (2X the standard rate). Warner Bros. and theater operators say they will debut the format this Dec. with the The Hobbit: An Unexpected Journey at regular ticket prices to test audience reaction. Studios hoping for another cash cow: TWX, DIS, LGF, VIAB, SNE, DWA, CMCSA (Review: 48 fps vs. 24 fps)