.. As pre-order bonuses. That's right, if you buy the game from Best-Buy, Amazon or GameStop (US folks) you'll respectively be rewarded with Jazz, Demolishor or Shockwave. Naturally it's best to go the Shockwave route. Because Shockwave rules.
Hopefully these will come out as "not-too-expensive" DLC for everyone later down the line. Though Activision is publishing this game, so expect to pay a ridiculous price for any planned DLC.