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Warner Bros. Unveils First 'Hangover 2' Trailer, 'Harry Potter' Footage at CinemaCon

Jeff Robinov, Ryan Reynolds and Todd Phillips participate in the final presentation from a studio at the convention.

LAS VEGAS -- Warner Bros. Motion Picture Group president Jeff Robinov -- who will inherit greenlight authority after studio president Alan Horn retires Friday -- made his first visit to the annual convention of theater owners on Thursday, promising that the studio will continue to make a diverse slate of films.