http://xbox360.ign.com/articles/958/958263p1.html
Help Shape Modern Warfare 2
Infinity Ward open to suggestion.
by Martin Robinson, IGN UK
UK, March 2, 2009 - Infinity Ward's put an ear to the internet, opening itself up for suggestions for the forthcoming and eagerly awaited Call of Duty: Modern Warfare 2.
Robert Bowling, director of communications at Infinity Ward, has set up a Twitter inviting fansto put forth their ideas to the phenomenally successful 2007 Modern Warfare. It's already quite a busy list, so it's best to get there soon to make yourself heard. Or simply write your request in caps.