From leaked info at Kotaku, Modern Warfare 3 has had a scheduled release date of November 8th, 2011. So far there have been multiple videos released depicting the same display MW2's elevator scene had. But this time around, it spans all across the world, from the United States all the way to Germany. More information has confirmed around 20 maps and a completely new EXP system.
More information on the topic can be found here.