No, I seriously doubt TV is an option.
1. Illegal in all states. Only if TV is in back seat is it legal. (You could put monitors in the front headrests.)
2. I don't ever recall BMW ever offering this in the US.
: It's always been aftermarket.
3. DVD would be worth it, perhaps. However for over the air TV, next year it will all be HDTV (so they say). Unless they are offering an ATSC receiver the TV option would not be worth it. I have not seen digital TV offerings from BMW in Europe, so I don't believe it is an option anywhere yet, but I could be wrong on this.
4. Now DirecTV, with a moving satellite dish on top of that CF roof that is coupled to the GPS nav so it knows where to point would be super cool. Skinemax, here we come!