I'd never have thought that I'd have to correct the almighty WW. Blu-Ray.

MS have stated that if Blu-Ray came out on top then they WOULD release a Blu-Ray add on.

http://uk.gamespot.com/news/6142137....ay%20add%20omn

That story is over a year old, I know, but recently MS have said again that they'd release a BD add-on if HD-DVD failed completely.