There are some little bits and pieces of a b&w rough cut of Star Wars on the 2004 DVD bonus disc documentary. In particular, on the Death Star where Han and Chewie are running down the corridor and the laser bolts are temporarily hand-scratched into the film.

Also, on the Behind The Magic CD there is about 7 minutes of rough cut cantina footage containing some alternate scenes and edits. And the b&w cut footage of Luke and Treadwell on that CD is probably also from the same rough cut.

That's about it, in terms of rough cut footage.

--SKot