There are two game packages:
-Standard, just the game.
-Collectors Edition, comes with a limited edition controller.
Both types come with an invitation to the Halo Reach beta (you access it through the "Extras" tab at the ODST main menu), if you pre order it, you also get a piece of paper (or an e-mail if you ordered online) which when entered (like a code, also from the "Extras" tab) unlocks Johnson for FireFight (at supporting retailers. If your planing on getting Johnson, make sure the store has it). Hope that cleared it up.
Edit: And on the whole "Bundle" thing. It's probably just another name for the Collectors Edition.
~Hunter
[Edited on 06.30.2009 3:40 AM PDT]