German magazines MAN!AC and GamePro have new previews of GTA IV in their latest (April) editions. Most of the information is old, but they did manage to reveal there is a radio station in the game called Beat 102.7, which is certainly new to us. Thanks to GTA-Xtreme.de for the info.
Perhaps this is one of the stations we will learn more about when Rockstar Games update the "Music" section of the official website on March 20th?
Related Link: GTAForums Topic.