Nightfall available through store?

Will we be able to buy Nightfall via the GW on-line store?

While i'm not affiliated with ANet, i'd have to say without a single doubt, YES. Though you won't be getting a collectors edition, just the regular plain edition since all the store sends you is a key and the CE ha more in it than just the game (usually).

most likely yes. But i would hate them if they continue with the purchase crap from the NCSoft website, can only purchase 1 item from the same card every month, i have no idea how they linked my account or did they just checked the IP, even if i use different account and attempting to by another copy from a different card, they limit my purchase as well, i have to wait for a whole day just to buy another copy of faction from a different card.