That interview is a big bunch of bull, lol.
He has stated time and again that he hates his hair. Yet, now that he can cut it according to that interview, he doesn't want to just in case a movie role needs it? He said himself before that he feels his hair forces period piece roles upon him. Then now he's growing his beard out too.
He certainly couldn't say "don't worry I'm not staying dead" right after we all saw that.
Like I said before, the entire NW plot would've been pointless. Why would viewers care about the Wall now? Also, why hint at his parentage all season just for him to die? Then why have Melisandre show up at the Wall just in time to say nothing?