IGN Speculates that the 360's GTA IV Second User Content to debut 6-1-09.

[Ausfalcon]

txrattlesnake said:
IGN Speculates that the 360's GTA IV Second Downloadable Content to debut 6-1-09 at the Microsoft Press Conference. http://xboxlive.ign.com/articles/983/983834p1.html

I hope they are right.  It would be cool to see another GTA IV add-on so soon after Lost and the Damned.  The quality on the last DLC was awesome, so I have high hopes for whatever they have as the 2nd DLC.