Just my opinion, but I think there is a possibility Apple may skip BluRay.
I was reading an article the other, some fellow who's involved with BluRay said that it had a life expectancy of 5 years, article was from September 2008 I believe. He listed as things that will limit it's life span; high capacity high speed laptop HDD's, the phenomenal growth of digital downloads, and holographic disc technology on the horizon ( 500 GB discs already, potential for 1 TB,
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).
What he didn't reference, but I read in another article, is that uptake of content on BluRay discs has been slow. A lot of the BluRay players sold in the US have come in the form of a PS3, and the low number of titles sold per player suggest PS3 buyers mostly aren't utilizing the BluRay.
On an anecdotal note, I have a friend who works in a DC for a very well known international discount chain, ( Wally World ), who told me they're scaling back their BluRay purchasing due to slow sales. What is selling well is SD DVD's with included digital copies.
I'll look around and see if I can find the links to the articles.
Looks like BluRay may be an expensive, passing fad.