I guess that's why it's labelled a "teaser" though, to try and make us look for clues as to what the game may involve. It's similar with the very first few GTAIV trailers, it didn't give a great deal away, and only lasted around 30 seconds, but the hysteria they all caused was amazing. Especially the first trailer, when that was released, there was thousands of people posting up their views on the internet of what maybe included and why. GTAIV worked it perfectly, but I don't think Infinity Ward have give us quite as much to "work" on really, maybe the next trailer will give us a lot more (fingers crossed eh?).