@LexX: I don't think DJ rendered the sequels because he's short on drive space with 4 projects currently closing in on release, but the scripts have been ready a long time.
Then they will need the same treatment that SW got: Cleaning up bad frames and all. After SW is released I will go through ESB shot by shot and write down the frame numbers of stuff that needs fixing and then we'll choose which ones are the worst, since ESB has thousands of frames with glue marks and such things. And very important is also to fix the color errors like purple/yellow lasers.
@poita: Thank you. You're gonna love ESB and ROTJ, they look great too!