It appears that the game is leaking other places as well. At least one video released shows off a tour of Forge in the game's Firefight mode, and spoilers for the game can be found everywhere from Bungie's official forums to NeoGAF (if you really want to see them, you can find them yourself).
While Microsoft and Bungie will be hosting the usual slate of Halo review events around the world in the coming weeks, it appeared as though the companies were relaxing around the usually tightly-controlled media access to the series by uploading the game to Xbox Live. Unfortunately, the system proved vulnerable to the insatiable demand for Halo, which facilitated another early game leak for this high profile franchise.
Update: A Microsoft spokesperson told Joystiq, "We are aware of claims being made regarding a security exploit related to Halo: Reach and are aggressively investigating the matter. We have no further details to share at this time."
