lol if u already got your reserved copy of halo 3: odst, then you are on your way of getting the new beta for halo: reach...
its going to b a down-loadable item, which u can only get if u reserved a copy of halo 3: odst... the day it comes out all you do is pop in the Odst disc and it will tell u the rest as u go along... nd it should be up and running around spring 2010...
[Edited on 10.02.2009 7:24 AM PDT]