I asked XM about the chains on her wrists and also about the promise they made awhile back about not making changes after the pre-order starts... here is what they said
"Under Storm's PO webpage, we have attached a disclaimer - Note: Prototype shown and pending final approval, final product may differ."
So it seems even if you pre-order they can makes changes right up to the ship date...
I'm fine if it's an structural issue but I someone doubt the chains on her wrists were structural or even a request by Disney, I would guess it was a change someone within XM decided they liked and so they made the change... Plus why open pre-orders if you haven't gotten final approval from Disney/Marvel yet?