Halo 4 spoiler alert: Has a major battle with the game's true antagonist already been blown by the game's own developers?

Halo 4 spoiler alert: Has a major battle with the game's true antagonist already been blown by the game's own developers?:
If any story ever seemed to exemplify the dangers of trying to be too clever when teasing your fans, it could be this one. Because unless this is all an elaborate red herring (and to be honest there's a decent chance it could be), then Halo 4 developer 343 Industries might just have accidentally leaked a fairly significant page of the game's script all over the internet.

Source:Google Reader