I took a look at the latest release of Game Informer magazine and they had quite a large article about Bad Company 2.
Found out something new, there will be a killcam in BC2. Although, snipers shouldn't worry about getting exposed. The killcam is purely for you to know about your killer. The killcam will just be zoomed in shot of the killer, with the killer's stats. You will also be awarded for hunting down and killing your killer.