Sort of a vague threat at this point, but Bungie posts a cute little throw-down to anyone cheating online in Halo 3...
Harbinger of Doom
There are those of you doing things you shouldn’t be in Halo 3. Some of you have gotten a little too famous for your own good. This ain’t a church and there is no redemption or salvation once you have been judged. Apologies are now officially too late to save you.
The storm approaches.