Image credit: Activision / Infinity Ward By this point, I'm convinced the Call of Duty series is a sick experiment testing the limits of mass deja vu. Infinity Ward, the makers of Call of Duty 4: Modern Warfare have just announced their new game Call of Duty: Modern Warfare 4. This new game has a linear campaign that sees North Korea bombard South Korean capital Seoul before launching a land invasion of the city. In one strand of the campaign you'll play as a South Korean soldier repelling the invasion, in another you'll play as a North Korean soldier on the other side of the battle, and in a third series regular Captain Price is off causing a ruckus. The reveal trailer does a good job of setting up the stakes: Watch on YouTube I've played and enjoyed many Call of Duty games, and Call of Duty: Modern Warfare 4 looks like it could be as good as the best of them or as bad as the worst of them. It's, after all, a cinematic trailer, so who can tell?…