So far, Yahoo's GTA IV content which they hyped up has been pretty abysmal. Today they redeemed themselves with the interview they promised with Dan Houser, Vice President of Creative at Rockstar Games. Now there's unfortunately no new GTA IV info divulged, although there are a couple of interesting points that are brought up. When talking about why Niko has come to America, and how Roman has lied to him, Houser added:

Niko claims to have left Europe simply for the adventure of America, but he is also looking for someone... and running away from some recent mistakes.

Obviously this someone is anonymous to us all at the moment, but perhaps tomorrow, things will be different, when this character will (presumably) be revealed in the second trailer, "Looking for that special someone".

Stay tuned for more info!

Link: Dan Houser interview @ Yahoo!