It's not about "fair game," it's about different people having different thresholds. I don't want to see Campaign + New Enemy stuff, even if it's officially released by 343i. But I do want to see multiplayer (and probably SpOps) stuff. I'm not the only one.
I think a side thread could work. It happens on the gaming side all the time with OTs and Spoiler Threads for the same game. A "Halo 4 MP Hype Thread (No Campaign Spoilers)" thread would be nice, so I don't have to totally ditch HaloGAF for five months (holy shit, guys, Halo 4 comes out in five months!).
I dunno. I'll check with the mods, and continue to seek feedback in this thread. If everyone's cool with it, I'll go ahead and make it, update it, etc. Then you all can choose to use it or not.