HHH/Batista will be the last. The dude who wins the Rumble gets to be in the Main Main Event. As in the last match.
Anyways... gimmick match for Cena/JBL? I say put them in one of my very own creations.... the GBSMWYCGBAPRRH! Which stands for the Gouging, Burning, Slashing Match Where You Can Get Burned And Possibly Really Really Hurt!
Replace the ropes with barbed wire. Surround the ring in a cage... Which is heated so it BURNS. Allow each competitor to bring in one trash can filled with whatever objects they want.