Rock, Paper, Shotgun thinks that a Halo MMO might be coming. Writer Jim Rossignol comes up with a laundry list of reasons why, some of which I don't find entirely convincing.

I'd probably play it if they made it, though. I originally thought Halo-- the first game-- would be something like PlanetSide. It'd be nice to finally see a game like that in a universe as compelling as Halo's.

...or is Sarcastic Gamer just happy to see you? More of you than they can handle, apparently, since the site is no longer accessible, leading me to depend on a report from Kotaku that the site, along with CVG, is citing the usual "sources" that a new Halo game will be announced at E3. Halo Chronicles? Halo 4? Lego Halo? Nothing at all? Time will tell.