I've been looking forward to the "New Stingwing" since I heard about them - I see what you mean but I'd take the extra damage quite happily, esp. because with the right card combos they could be doing 5+ wit Armourbane (not that Sting-Wings couldn't either, but still...)
I feel your scepticism about the event - definitely targeted at shadowsun, and has some potential but depends. Could also have limited use with Aun'shi to keep non-ethereal units hitting for longer, and to post-pone aun'shi himself having to retreat (which keeps Armourbane in play) - but you'd have have the units w/ attachments there.