For all of you wondering about the finale listen to this. About Zuko's mom they can reveal it in different ways.

#1- it will be a TV special which will air in the future

#2- it will be a dvd bonus feature

#3- it will be a comic book special (like the ones in the dvds or maybe a realy comic book)

#4- they left it like that on purpose and M Night will figure it out in the movie

#5- more avatar episodes

Seriously, I bet they made tons of money off this show. I really don't think they'll just let it end like that when they can keep it up. There'll probably be more Avatar in the future even if it takes a few years to create. As long as avatar's a hit and makes money I'm sure they'll keep going. *Pokes spongebob* I seriously don't think the creators of that show intended it to be on TV for years now, but it's still going.