If you're like MTV Multiplayer and didn't really understand what MGO is, it's basically multiplayer Metal Gear Solid set in the world of MGS4. And it's not a separate game. Not really. It will ship with MGS4 and is in fact going to be on the same Blu-Ray disc, according to the Konami rep who played MGO with MTV Multiplayer at the convention. The game will be amplified with later expansions.
Like any other Metal Gear game, MGO has a mix of the conventional and the absurd.