That's right. Lucas being the pioneer film maker that he is has actually re-animated the corpses of British Actors Alec Guinness and Peter Cushing to play key roles in the next film. I know, shocking isn't it? Guinness is rumored to be playing someone called Ben. Possibly the brother of Owen Lars. Cushing is rumored to be playing an Imperial Governor. Likely Tarkin aka the man standing next to the Emperor and Vader at the end of ROTS. Rumor has it that Christopher Lee suggested him for the part as they were good friends. This also suggests how many years have taken place between ROTS and Episode IV.