Halo 3... Mythic?

There has been rampant speculation following the release of the following screenshot taken by the guys at Addict Gaming during PAX.

Not much is known regarding what this Halo 3 "Mythic" screen means, although since then, more screenshots have been taken from PAX of new map-pack related achievements and the the website theorizes on what this "Mythic" thing might be. An expansion to the campaign, perhaps?

While I certainly wouldn't mind more Halo sooner or later, what I really want is a patch or update that lets Halo 3 render at a higher resolution, or some sort of severe antialiasing support. While the textures are sharp and the artistic design is fantastic, if you play on a big TV there are some unpleasant jaggies that make my eyes sad.