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Is it possible that Zayle, Shadow Cloak isn't actually part of the RoS set?
This is probably wishful thinking, but since there are only 2 Neutral Legendaries left to reveal (and 4 Legendaries total; pace yourself next time, Blizzard), maybe, just maybe, Zayle just isn't in the actual set at all. I remember reading that the golden Zayle you get in the adventure was uncraftable and undisenchantable, and that we simply can't get Zayle in packs. Please correct me if I'm wrong here.
But if that's the case, I think it would make Zayle pretty special, much more than Whizbang.
Liv
Zayle will not show up in packs. There are 5 Neutral Legendaries, not including him. You get the golden version in the single player content, but if you want the normal one, you have to craft it.
Liv
Rise of Shadows, but he won't show up in the collection until the single player content releases. And not in card packs.