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Apparently Robert Downey Jr will be playing billionaire Tony Stark, aka superhero “Iron Man”.
I think that's an inspired choice, considering the histories of both the actor and comic character...
Iron Man role for actor Downey Jr
However, in the version shown on TV, Sebastian Shaw is replaced by Hayden Christensen, who plays Anakin in the prequel movies Attack of the Clones and Revenge of the Sith. After a spot of researching, I learned George Lucas tinkered with the ending, apparently to strengthen the relationship between the original trilogy and the prequel trilogy:
I know my response is wayyy too late, but George - whatever your reasons for modifying the ending, I wished you'd remembered the old maxim: if it ain't broke, don't fix it!
Star Wars: Episode VI - Return of the Jedi (1983)