Sorry if this has been mentionned before.
We had a familly outting today, and the consensus finally fell on National Treasure (not my first choice, mind you, but it was .. ok. Definitely -very- far from anything factual, but ok).
I had the pleasure to see a new Goofy short animation before the film, in the classic line of the "How to". This one was about Goofy getting everything you need for a brand spanking new HD Home theater system.
What marked me, beside the animation being quite funny, is that Disney totally showed their comitment with a very small but telling line in the vocie over.
Instead of merely listing "A HD player" among the items bought, it specifically said "A Blu Ray Player".
To be honest, I was trying to listen closely but the list was going fast, and I do not think a "HD DVD player" was mentionned, but this might call for another person to confirm
There you have it for the sceptics. Disney is so committed to the format they'll even put it -inside- their animation for X' sake.