I run a Halo Info website, and like to give the Facts to my Friends on XBL.
According to this site BNet, you simply need a Copy of ODST to get a Beta Code.
However according to a Friend he found out from a Xbox.com Video that you need to Pre-Order the Game to get it.
So if anyone can supply a solid source that says which is correct, Thanks.
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Just buy the game. On an ign video Joe Staten was showing the menu and said that access falls under the Extras' menu so you just need the game. The only pre order bonus is Johnson.