Interplay has opened a forum dedicated to posting Project V13 concept art, presumably mostly by their lead concept artist Serge.S. Chris Taylor notes:
Some of the concept art for the game has been released due to the lawsuit. This forum will be a place where we can post high quality versions of the same art and you can give us some feedback on it at the same time.The first piece can be found here.
Keep in mind that this is concept art. It's not finalized art, but it will give you a feel for what we are aiming for with V13.
(And I'll keep bugging the lawyers to release more art when we can... I'm pretty excited that we're finally able to show you some of the work that we've been doing up until now.)