We've all seen the big surprise at the conclusion of The Search Part 1, but that is only the beginning. Ever since he took over as the lead comic writer of the Avatar series, Gene Yang has been bound on bringing his own vision of the series to light. He has gradually been dismantling the ending of Sozin's Comet as Bryke presented it in 2008 one peace at a time. In the beginning, he pretended to reluctantl accept Kataang and included it in The Promise, but he made it so corny that people would begin to hate it. Next he took apart Sukka and put together Zuki like puzzle pieces welded by a master puzzle maker.
You're probably scratching your head at where the revelation that Zuko is not Ozai's son fits into all this shipping. Basically, he's changing the big things in the Avatar world, one big thing at a time. He has to establish himself before he can tackle Kataang, his biggest obstacle of all. This gives him the chance to add yet another twist to his books with the breaking up of Zuko and Suki. Man, it seems like Suki is the new one that gets around in ships besides Katara. Maybe Suki and Aang next? I don't know what happens next, but I do know where this story is heading, because Gene Yang has already revealed to be a Zutarian. All we can do now is accept it and brace ourselves for it. It's going to be a very different world than the ending of Sozin's Comet that we all remember.