“We firmly stand behind the HD DVD format as the best choice for consumers. Current reports indicating that Microsoft has a back-up plan, which includes Blu-ray support are incorrect. We’re fully committed to HD DVD and have absolutely no plans to support other optical formats,” Mr. Rodman states.
Will they change their tune if the Blu-ray ends up being in-demand? It seems unlikely, but isn't out of the realm of possibility, especially if the PS3 ever picks up.