There's a new iTunes beta version out in developers' hands straight from Apple, and a forum poster over at Mac Rumors found a little something fun in the About screen: a reference to Gracenote's ability to identify Blu-ray discs. Gracenote is the service that IDs your CDs when you import them into iTunes, so you don't have to sit there and type all the track names and artist information in. Apparently Apple is mentioning that not only CDs and DVDs, but also Blu-ray discs, will get information from Gracenote in the latest version of iTunes.
This doesn't mean that Apple will adapt Blu-ray as a standard (though it would probably be about time, don't you think?). But it should mean that the future version of iTunes will include Blu-ray support, so if you happen to have a Blu-ray drive hooked up to your Mac, you'll be able to read or play the discs via iTunes.
It could just mean that Apple has upgraded the Gracenote version in their app, however, and that they have no plans to actually use it -- the text in the About screen could just be a boilerplate cut-and-paste from some required Gracenote documentation that happens to include "Blu-ray." We'll have to wait and see just what shows up in 8.2 when it eventually releases to the public.