Aang and Katara were to be together, not Katara and Zuko. Most of Avatar: The Last Airbender has pointed to that. The creators have confirmed that they have always favored a relationship between Aang and Katara. Avatar Extras have been known to lie on more than one occasion as it is something for fun and not necessarily for facts. The trivia in "The Ember Island Players", which says that the writers and creators toyed with the idea of Zuko and Katara falling in love, is made purely for fun. A direct interview with the creators themselves trumps a small bulletin in something that was meant for fun in terms of credibility.