CinemaCon 2011

Hemsworth arrives to promote his upcoming film 'Thor' during the opening night of CinemaCon in Las Vegas, Nevada on March 28, 2011. (AFP/Ethan Miller)

J.J. Abrams, director of the upcoming film 'Super 8' introduces clips of the film to the audience during the opening night of CinemaCon, the official convention of the National Association of Theater Owners in Nevada on March 28, 2011. (AP/Chris Pizzello)

A visitor walks past movie posters during the first day of CinemaCon 2011 in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

Jennifer Yuh Nelson and Jack Black joke around as they arrive to promote their upcoming animated film 'Kung Fu Panda 2' during the opening night of CinemaCon in Las Vegas, Nevada on March 28, 2011. (AFP/Ethan Miller)

Jack Black, who provides voice work for the upcoming animated film 'Kung Fu Panda 2' during the opening night of CinemaCon in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

Director Jennifer Yuh Nelson and actor Jack Black arrive to promote their upcoming film 'Kung Fu Panda 2' during the opening night of CinemaCon, the official convention of the National Association of Theatre Owners in Las Vegas, Nevada on March 28, 2011. (AFP/Ethan Miller)

Jack Black does a flip as he promotes his upcoming animated film 'Kung Fu Panda 2' during the opening night of CinemaCon at Caesars Palace in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

Hemsworth arrives to promote his upcoming film 'Thor' during the opening night of CinemaCon at Caesars Palace in Las Vegas, Nevada on March 28, 2011. (AFP/Ethan Miller)

(AP/Chris Pizzello)

A cameraman films in front of posters for the upcoming film 'Friends With Benefits' in the lobby of CinemaCon 2011 during the opening night of CinemaCon at Caesars Palace in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

Jeffrey Katzenberg and J.J. Abrams mingle during the opening night of CinemaCon at Caesars Palace in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

J.J. Abrams, director of the upcoming film 'Super 8' arrives during the opening night of CinemaCon in Las Vegas on March 28, 2011. (AP/Chris Pizzello)

Jack Black shows off kung fu moves to the audience while promoting his upcoming animated film 'Kung Fu Panda 2' during the opening night of CinemaCon 2011 (AP/Chris Pizzello)