nasty_khakis said: "No offense meant, but based on this casting we can assume we won't see much...dancing, right?"
Don't know if you are old enough to remember that Fosse chose the fabulous Roy Scheider ( who was not a dancer though light on his feet due to his amateur boxing training) to play his alter-ego, Joe Gideon, in Fosse's semi-autobiographical "All That Jazz" (one of the greatest movies of all time). Although the scenes where Scheider actually danced did not make up a majority of the movie, Scheider trained and handled the dancing segments quite credibly, Ut clearly made sense for Fosse to go with someone with the stronger acting chops who you could train to dance. So, take heart, like Scheider, Rockwell is a pretty intense, immersive actor, and the type who will, no doubt, get the dancing right.