An inside source has today alerted us that Kikizo, GameSpot, IGN, GamesRadar, CVG, and 1UP will be going to the Rockstar Games studio to test run Grand Theft Auto IV again to gather new screen shots, information and much more about the new build. They are expected to visit this week. We should receive some content by the end of this month as soon as it is available from them. Stay tuned for more.

Update: Planet Grand Theft Auto has some more information on this:

It's no secret that the release of Grand Theft Auto IV is very near, and with that will come new previews on major gaming websites.

IGN, GameSpy and TeamXbox received their simultaneous demonstration earlier today in a San Francisco hotel. They had just over an hour with the game, and while they can't say anything regarding what they were shown, I have been told that the game is looking very polished at this stage. Previews from respective sites will be going up next week with new information and screenshots! Stay tuned!

Keep watching for updates over the next week!