There is no way in hell that an HD-DVD or Blu-Ray Disc version of the OOT would be in letterbox. Lucas would loose all credibility and become the laughing stock of Hollywood. They wouldn't even allow it I bet. So if the OOT ever does see a high-def release, you can bet your ass it'll be anamorphic, unless Lucas is wearing a straightjacket at that point. He isn't that crazy YET.