You may have read somewhere else already that press reviews of Halo 3 (much like Halo 2 before it) are handled in a somewhat different way than other games. Bungie doesn't mail out review copies to journalists in advance; if they did, it's possible the game's ending would have been spoiled by now. GamePro has an article up that details this alternative procedure.

Just as was done previously in Australia and Europe, next week in North America Bungie will be setting up 24-hour gaming sessions on both coasts; one representative from each invited organization will have access to the entire game, but no one will be allowed to publish a word until September 23.

Thanks Louis Wu for the heads-up on this story at HBO.