Keep your eyes open throughout Episode II, there's deliberate story linkages that will be used in Episode 3. But here's the stuff I promised you: I was told some of the working title names for Episode 3 that are currently doing the rounds at JAK Productions and Lucasfilm. The most popular one right now is a title with the word 'circle' in it, as in something Vader said 'the circle is complete.'
In addition Rick McCallum has answered one question that has been looming on the fans' minds on the official site...
Q: Who will be joining the cast for Episode III?
A: Look for most of the actors from Episode II to return with the story focusing on the characters played by Hayden Christensen (Anakin), Ewan McGregor (Obi-Wan), Natalie Portman (Padmé) and Ian McDiarmid (Palpatine).
Basically everything's been cast except for incidental characters. That obviously won't begin until we're further along on the script.
Also, if you receive the Star Wars Insider Newsletter you are privy to some info about the current production of Episode III!
"We have a production art department in London that's started, feverishly. We have a costume dept. that starts next week in Sydney, and then the production art dept. moves to Sydney in the beginning of 2003. So all systems are go. We start our basic construction of the things that are needed in each dept. (in Australia). In about two weeks, we'll have our new set director Richard Roberts, come into Sydney to scout locations and service companies. This is just the beginning of the pre-production on the film."
Dont't forget to also check out: Star Wars: Episode III - Revenge of the Sith