I'll just make a list:
- I want it to be it's own series, not just a sequal to The Last Airbender.
- I want to know pretty quick what happened to the main characters.
- Energybending: make an appearance, maybe explain it better.
- Earthbending: less of it. Seriously, it's the most used in the entire series.
- Aang as a past avatar, hopefully with a little more maturity.
- The fate of the Fire Nation.
- Airbenders: more?
That's about it; comments?