Anyway, it is true they are rereleasing them in 3-D, but since the Star Wars universe is so large, it is also likely there will be more, newer ones coming along in the future.
I have heard a rumor that Lucas wants to make post episode 6 movies. He has said publicly that he will not make anymore movies after the Clone Wars movie came out though.
I really don't think that Gourge Lucous is going to make another Star Wars movie. There maybe rumors about thiers going to be another Star Wars movie but i doubt there is going to be another one and i have not heard any of the rumors that people talk about thier is going to be another Star Wars movie.