Well, i don't know how i feel about the preview. Kelly DOES look amazing while wearing both outfits. Those scenes that we can see in the preview do remind me a lot of Stronger and Dark Side music videos. I hope those are shown just in order to not spoil anything.
I hope/think those scenes of the little girl and Kelly being a scientist/doctor are taken from some kind of "prologue" which would tell the story of "experiments" on children with superpowers or so (like in X-men Origins
) and then it would go wrong and Kelly would find hereself having some of those super abilities and being imprisoned by other scientists and then the song would start to play. During it Kelly would encourage other mutants and eventually there would be a revolt and the mutants and Kelly would break free.
)
Already Gone is perfect the way it is 
"You couldn't have loved me better"part kills me 
