Here (computerandvideogames.com) and here (pcgameworld.com) are interviews with the lead designer for the game. He talks about some of the new content (which will eventually be available for download via X-Box live, so fret not, X-boxers) and other aspects of the game.
Also, here (pc.ign.com) and here (gamespot.com) are some hands-on previews. They don't say much more than that the game will ship something this November. (I *know* I saw it say somewhere that the date was 11/18, but I can't find that now for the life of me...)
Right... I'm pretty sure that GTA: VC will eventually come out for PC, but there has not been an official announcement yet. Here's hoping that if it does come out for PC, they do a better job with it than they (according to what I've heard)