If you're curious about the upcoming formats for the DVD genre of media, head on over to BFR, where they've posted an in-depth look at Blu-Ray, & the technology behind it.

"High-definition video is the industry’s next highly sought after technology which brings much better picture resolution and clarity into the homes of consumers. However, with the advent of HD video there is a need for bigger and better optical storage solutions due to the fact that today’s DVD simply doesn’t have enough space for HD video."