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I remember reading somewhere that DVD Player plays both HD-DVD and Blu-Ray formats.
 
This late in the game, someone with a dev build should be able to answer this.

I have a Blu-Ray player but no access to Leopard though.
 
I haven't heard any stories of it actually working. I've heard that it should, but haven't seen any proof.
 
With one of the earliest builds I saw that the ability was added,

look through the mac rumors archive of stories,

I saw a story showing that HD/BR prefs had been added, but that it still wouldn't actually play the movies. If someone can confirm that they actually play, then please post here :)
 
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