Sheesh, high tempers in here!
Like some one said earlier, those quotes at least cleared up one thing, aang didn't fully go into the Avatar State, so the avatar line and all that good stuff is still strong.
(opinion part)
1. I have to say that Aang probably died, but hey, I'm not Mike or Bryan, so who am I to say. I can say that they put??a lot??of foreshawdowing and little hints towards "death" and "the avatar state". Avatar Roku's whole entire speech for one, and then in the previously on avatar thing, they only showed the "if you die in the avatar state..." part, and yes I do think they were trying to go with the mary and jesus dipiction, Avatar has a lot of meaning behind it, so taking the idea from the statue/sculpture is about as meaning full as you can get. Azula also didn't just want to hurt Aang a little bit so he would need a power rangers band aid, she is a "cold blooded perfectionist" and wanted to kill, I repeat, kill, her target. She isn't stupid, far from it in fact, so I think she knew what she wanted to do, and yea, lighting isn't exactly the easiest thing to survive. So while there is a chance he could have survived and was on death's doorstep, he probably died, but all his super cool avatar powers weren't lost.
2. This following opinion is not just becuase I happen to support kataang. I don't think he let her go. If you think about it, he "let her go" becuase he loved her so much. So it was replacing his "little boy crush attachment" with actual love (corny cheesy, yah yah). And the whole "well he didn't officially go into the avtar state and open his chakra", and kataang has by far been the most evident ship in avatar (at least aang loving katara) so I don't think the creators would just flush it down the drain. Love isn't just a switch you can turn on and off, aang will always love katara, but he might have to "let her go" by her not getting in the way of what is most important, aka, him destroying the fire lord. I like one point some one brought up, ozai may use aang's love for katara agianst him, so aang will have to choose. And of course aang's smile at the end.
So there yah have it folks, enjoy.