From IESB.net:

IESB: "Now the Star Wars TV series that you completely just shocked
everyone over at the Indiana convention, when does that go into
production? Or do you already have a team in pre-production?"

LUCAS: "Ah, we're getting ready to go on the animated series, and then
the live action will be, you know, a year or two later."

IESB: "Now, it's going to take place between Episode III and Episode IV,
or are we going to see some back series, like Knights of the Old
Republic and all that stuff."

LUCAS: "Well, there is a possibility of that, but not in this series.
You know, there's a possibility of more series if these work."

IESB: "And the last question... Was Sith truly the last Star Wars film,
or do we think maybe in the future, if the series is so successful, that
we might see another [George starts slowly shaking his head at this
point] young director taking on Star Wars and making another feature film."

LUCAS: "Nope. This is the end of it."

IESB: "This is the end of it."

LUCAS: "Yup."

IESB also got to ask Steven Spielberg a few questions. Steven Spielberg