Disney is on the verge of putting Rob Marshall in as director of a fourth installment of “Pirates of the Caribbean,” a move that puts the film on track for a 2010 production start, with Johnny Depp back as Captain Jack Sparrow. [EDIT] While Marshall’s involvement wasn’t immediately confirmed, sources said things look good enough that the studio has begun casting new characters that will appear in the picture....says Mike Fleming over at VAIRETY. Marshal, of course, directed CHICAGO, the forthcoming NINE...