It looks like it is over, not unless they make a new series, showing how the Avater and the gang rebuilt the world, then maybe. It stinks that they didn't have a mystery left at the end, like in the other season finales. So with my guess.. this was it, but I have to agree, I wanted to see Zuko's mother, and how or where she is. Who knows what will happen. The creators did say they really liked the "Avatar World"... who knows, since the avatar was so popular, maybe they will bring a new villan or problem in a different generation in the avatar world. I just hoping that they keep the same characters. lol