From what I've heard, Lucas is waiting to release episodes iv - vi on dvd until after episode iii is released. He's never been happy with the technology that was available when he made iv - vi (hence the special edition theater releases) and wants to "finish" or "fix" A New Hope, Empire Strikes Back, and Return of the Jedi with the latest technology before releasing them on dvd (that is, after the release of episode iii at the earliest). What does it mean? Probably quite a few new additions like we saw in the special edition versions...hopefully they look better than the Jabba added scene (that scene was a joke)!