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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It would be awesome if Bungie released the beta on November 10th to take away from Modern Warfare 2. Although I don't think we'll get it until next spring/summer like the H3 beta.