No, we don’t know what they mean when they’re discussing “exclusive information.”
GameStop has announced that those who pre-order Modern Warfare 3 will get a 2-sided poster that comes with “exclusive information” about the game. We don’t know what kind of information they’re talking about and it will probably make it to the Internet eventually, but GameStop is only offering the poster to the first 500,000 pre-orders so you’ll want to act quickly if you’re the sort of Modern Warfare fan that needs to know everything.
Source: IGN