To be honest, Zelda plays mostly the same.
Now if we punish a spot/air dodge or roll with UpSmash, it has some reward, but the move is still super situational because of its terrible range and end lag. It now has some use, but it's still not a good move; still a sub-par smash attack in my opinion.
I think n-air > FW needs to be explored more in actual matches against skilled opponents before we go around saying this is Zelda's saving grace. It is a situational KO set-up, and I'm not sure how reliable it will prove to be. Let's not repeat what happened when the game was first released: everyone was going on about how FW was so great and it was such a great KO move - then we learned it's fairly easy to escape the 2nd hit.