I also want to be surprised by Rogue. The best surprise would be seeing Rogue doing physical damage. Borrowing Storm's, Iceman's or Magneto's power would be kinda the easy way out and they would be out of action for a while to recover, so I'm not sure if that makes sense unless Iceman or Magneto are dying and they willingly give their powers to Rogue. Let's hope we'll get something creative or just give her the strength and flight abilities already!
Elemental powers do have the capacity to be very epic, but some physical fighting can also do the job. I remember seeing X1 for the first time, that moment where Mystique (as Wolverine while turning into her natural form) kicks Wolverine in slow-motion, falls to the ground and licks her upperlip felt very epic for me. Now, it's still amazing but the special effects are a bit dated.