Yeah, teasers are meant to do just that: tease. But I hate teasers where they show nothing. At least through a bone in there or two on what the game looks like. Here's a trailer that's been labeled as an E3 teaser for
Assassin's Creed II. Yeah, nothing of the game is shown. At least
Modern Warfare 2's teaser had a little glimpse of the game albeit in a weird green wavelength sort of way.