From the Digital Bits:
We've checked in with our retail sources, and have been told that Lucasfilm tentatively plans to debut Star Wars: Episode III - Revenge of the Sith on DVD on 11/1. This would seem to be corroborated by a report from The Force.net today that indicates an 11/1 DVD release for Episode III, along with a new 3-title box set of the prequel trilogy and a 6-title box set of the complete saga. We can't confirm the box set information at the moment, so take all of the above with a grain of salt until official announcements are made.