http://www.nick.com/games/tournaments/avatar2/play.jhtml?game=av_phoenix
The game is called, "The Phoenix King". The characters speak and although it is not massive spoilers, it could be possible that it is actual dialogue from the finale. Also, the background can also give us a clue on to where and how exactly the finale will take place.
Speculations?
(PS: I guess this could count as a failure thread, but also keep in mind that I've been out of the country for 2 weeks. If it is a failure, flame me "nicely".)