http://media.ps3.ign.com/media/906/906158/vids_1.html Video Teaser.
"Each of the three cities is jumpin' with specific music tracks. That isn't to say the meaty soundtrack will be limited by location, just that local bands will be more likely to air in their home cities."
"Proving Ground's landscape is twice the size of Project 8, with all three cities connected in multiple ways. You can even grind the subway from Washington D.C. to Baltimore."
I think this game will be a nice little breakthrough for Neversoft since THP8 sucked as well as American Wasteland.