For the pre-order of Call of Duty: Modern Warfare 2 you will get the opportunity to play the company a week earlier

Usually the story mode for Call of Duty is released during the release of the game itself, but not this time. For anyone who pre-ordered the digital version of the game, it will open a week earlier.

Here's What We Know

If you pre-ordered a digital copy digitally at Xbox or PlayStation stores or on Battle.net or Steam on PC, you'll get a chance to complete the story mode before multiplayer even launches. Specifically, it will become available on October 20 at 10:00.

According to Activision Blizzard, the company includes missions in Europe, Asia and America. In addition to the standard "capture-kill" missions, there will be naval sieges with underwater battles, aerial battles and stealth missions.
Also, previously, pre-orderers of the game had the opportunity to take part in testing the game, but it ended.

Source: videogameschronicle