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http://dvd.ign.com/articles/524/524681p1.html?fromint=1

Sony has 1,500 titles ready to go for High Definition, according to Fidler. Any Sony DVD that has "Mastered in High Definition" on the back of the case means it's ready to be reissued for a Blu-ray DVD player.

A single-layer Blu-ray disc would allow for up to 135 minutes of high definition video, three languages and two hours of regular bonus material. A dual-layered disc, though, could hold three hours of HD video, a DTS mix and two hours of HD bonus materials.

To put it another way, that's the two-disc version of Master & Commander: The Far Side of the World or each of the Extended Editions of The Fellowship of the Ring and The Two Towers on a single disc. With a 36 megabits/sec. data transfer rate, it will put even Sony's Superbit DVDs to shame.