I'm guessing it would be a little bit Farfetch'd if Kyurem kept Ice Burn or Freeze Shock after separating with whatever dragon it merged with.
But how Trollfreak game'd us...uh, lemmee try that again...
Anyways, they show us promotional trailers and videos that show each form using Thunder and Flamethrower respectively, yet the only move of those elements it can learn in each form are the Fusion attacks. At least give us Blue Flare and Bolt Strike too for crying out loud!
Or a TM compatibility with each separate Forme! --- http://i206.photobucket.com/albums/bb246/senrinbukishi/Artwork/313UKBoard.png Official Kyurem (ncluding all of its collective formes) of the Pokemon Boards.