IGN has posted up an article today with an interview with someone from Rockstar named Aaron Garbut. It is definitely worth a read, it explains Liberty City in full detail. He also explains how the game will be nothing like the other GTA's besides the general feel. The article also has some new screenshots up that will be shortly added to our screenshots section.
You may read the article here: http://xbox360.ign.com/articles/868/868124p1.html