Since the countdown to the trailer has begun, there has been much debate and worrying around the internets as to whether it would just be a brief teaser containing only a few glances of the game. According to this article posted at GamesRadar.com yesterday, it will be anything but.
"The official trailer for Grand Theft Auto IV is only a few days away as of this writing, and publisher Rockstar has promised that it won't just be some infuriatingly quick teaser. Instead, it'll offer up the first substantial look into what the game is all about, and internet speculation over what that might be has kicked the rumor mill into high gear."
Be sure to read the rest of the article, as they've compiled seven pages of good (and some just plain crazy) ideas for the game.