"No, we're not [tied into a specific platform for new IP]," said Jarrard explaining that "in theory we do have every means to go out and find the right ecosystem, the right partners, to align with. So who knows what the future will bring us." Though, Jarrard did praise the Xbox 360 and Xbox Live as a social platform for their past projects including the entire Halo franchise.
That said, we'll wager our entire IRA (which isn't worth much these days) that Bungie's new IP will make its way onto an Xbox platform. It's a no-brainer.