There is going to be a trailer for Grand Theft Auto IV coming 3/29/07
Link: http://www.gamespot.com/news/6166642.html?action=convert&om_clk=latestnews&tag=latestnews;title;0
Link: http://www.gamespot.com/news/6166642.html?action=convert&om_clk=latestnews&tag=latestnews;title;0