From that preview its very obvious that this episode is NOT filler like everyone says it was going to be be AND that it is going to be very ship heavy.

But thats not necesarily a bad thing. Dealing with the shipping in this episode means that the finale is left to deal with just the storyline and action.

And also In another thread I predicted that there would be a whole lot of awkwardness if the Gaang watched someof the private moments that were had by Katara/Zuko and Aang/Katara in the Ember Island play. Dude this episode is gunna be awesum, for shipping that is. All I can say is AWKWARD!!

Katara wouldn't say "now's not the right time" if she didn't have some feelings for him. She would have to let him down. It's not that she doesn't love him back, it's just that she realizes (and so does Aang, I think) that there's other stuff in the way that needs to be handled before they can focus on love.

I think it's a direct part of the whole attachment thing. Aang couldn't master the Avatar state because he put Katara before everything else, and Katara is trying to tell him that he can't do that; that he needs to focus on saving the world first. Basically, that they need to "let go" of each other so that they can fully focus on defeating the Firelord. It's the exact same message that the guru was trying to give Aang. But I think a lot of people took that message too literally and expected it to mean that Aang would have to completely give up all his feelings for Katara for the rest of his life. I don't think that's true. He can still love her, and she can still love him. Aang just needs to understand that this final battle is what he needs to focus on most, and that love can wait until he's fully accomplished his true destiny: defeating the Firelord.