Looks like Infinity Ward is ready to start teasing us for CoD: Modern Warfare 2. Interestingly, the trailer doesn’t explicitly use the “Call of Duty” name in any way. It could be that they’re building the “Modern Warfare” brand into it’s own franchise.
Other than a release date (November 10), the trailer doesn’t reveal much. However, a frame-by-frame viewing will allow you to see some interesting gameplay locales: a plane, and oil platform, a castle of sorts, and possibly even a submarine. Additionally, there seems to be some sort of whispering about 55 seconds in, which could indicate that this is the start of a viral marketing campaign.
Check it out in HD: