rcb said:
The end battle in one revision was supposed to happen below coruscant in a lava room.
something like mustafar then ;)
If you haven't read the rough draft of Revenge of the Jedi then here it is
http://www.starwarz.com/starkiller/scripts/revenge_revised_rough_draft.htm
I read it around the time Revenge of the Sith was released in 2005 and I loved it; though I know that it would have been such an expensive film had it been made.