Sozin's Comet, Part 1: The Phoenix King

This the 1st part of the upcoming 4-part finale of Avatar. These last four episodes will be combined together to create a 2-hour long movie. The kids return to the Fire Nation and prepare for their final confrontation with Firelord Ozai, but they discover that the Firelord has plans of his own: he has ordained himself Phoenix Lord and appointed Princess Azula as the next Firelord. In the spectacular 4-part finale of Avatar Book 3: Fire, Aang fulfills his destiny as Avatar and confronts the Firelord in the greatest battle of the series.

Fan Theories Derived from NYCC Trailer

 * Katara will Bloodbend again.
 * Katara will manipulate rain.
 * The Gaang will split up.
 * Katara will fight in the Fire Nation Royal Palace.
 * Zuko and Katara will sneak into someplace.
 * Azula and Zuko will battle on top of an Airship.
 * Azula will be confronted by either her mother, Ursa, or an image of her and Azula will lose her temper.
 * The Comet will come before Ozai is defeated.

Other Fan Theories

 * Iroh will return and more information on the Order of the White Lotus will be revealed.
 * Either Aang and Ozai will both tap into the power of Sozin's Comet or Aang will use the Avatar State and Ozai will use the Comet.