From the top of my head, not really. Most of the stuff you hear is like, "What the heck", and that's not even really swearing.
Chat with our AI personalities
Halo Reach has the words "Bastard" and "Bitch." Nothing else from what I have heard through the entire campaign.
you get the multiplayer beta with odst but not the whole game it the beta comes out may 3rd 2010 halo 3 odst included also xbox live gold
Unlock Halo 3:ODST's Campaign Complete Achievement. Once you beat the ODST campaign, visit Halo Waypoint on the dashboard to unlock the item.
Halo 3, Halo wars, Halo 3:ODST and Halo:Reach
it goes halo, halo 2, halo 3, halo 3 odst and soon halo reach will be available