Potential Rumor Spoiler about the Equalist leader: He's actually the son of Azula and instead of wanting "equality," he wants to wipe out bending completely (maybe he was crushed by not being born w/ bending powers?). BTW, they are supposed to have an army later on that uses the bend-blocking skills that Ty Lee used in Avatar. We shall see how this unfolds, but I am INTRIGUED!
Also, I'm glad they didn't try to do an Avatar-lite. This definitely feels like something completely new but with some fanservice added in here and there