I bought the DLC, it's the Casino add on. I didn't realize what this really was, but it's a fully functional online casino where you use your in game money, and it's actually pretty good. There's Roulette, Slots and Poker. I'm really surprised by it, mostly by how good it is. If you get the chance check it out.  
 
This game is freaky in the best possible way.

I think they quickly pushed that out because people sure weren't staying for the racing.

How much was it?

The Casino is pretty good from what I hear. Unfortunately I never got it with my copy of the game despite buying it brand new. You can win cars on the slot machines, including the Audi R8 and the Audi R8 Spyder, but I am not sure how you do it. In any case, there seems to be quite a lot of content to the casino.

Because... Racing games.

Everything I've seen and heard about this game is really weird in a "developed in western Europe" way. So stiffly robotic, but then sprinkled with odd personalty. I can never tell if those guys know that these games cone off as ridiculous.

That game is fucking bizzare.

The Online casino was free if you pre-ordered from Gamestop.