I'm going to shrink this cause it's spoilerish, but... Walt's special-ness is most likely going to be explained in season 6
I don't think that's very spoilerish because
you said "most likely". If you've come across some information that says it'll DEFINITELY be explained, then I think that would be spoilerish. But the way you say it makes it sound like a guess, a theory, and we've all got theories 
My favorite, which I was really hoping was true, was that Walt grows up to be Matthew Abaddon and ... I don't know. It kinda goes nowhere after that
But if you've heard that the Walt backstory it one of the remaining questions that will definitely be answered, then please PM me. I'd love to hear more.Sorry but I don't think it is spoilerish either. Nothing definite right? I hope he does not end up like that it would be so so well so not what i would want to expect. Anyway it just doesn't work int he equation.
Though it does give me thougths about something else, later I will explain also if you have real scoop pm or e-mail
