Getty/BackgridMichael Jackson's biopic promises to be a pretty long film -- that's what the film's key producer is saying anyway, and it's gonna be chock-full of all his greatest hits.
Graham King made a surprise appearance at Lionsgate's CinemaCon panel Wednesday, where he talked about the forthcoming "Michael" movie that chronicles the late singer's life ... and they even played a first-look trailer at the event.
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