The better Blu-Ray-Disc
Just a few minutes ago I read an article about a new DVD-like storage disc, theDigital Multilayer Disk. It's a new invention from D Data, which work largely like today's DVD technique, but provedes up to 15 Gigabytes of storage. It makes this possible by packing more layers together, not with reflective but fluorescent data layers.
To learn more about it, look at their technical page.
I personally think, that this is a better successor to the DVD than the Blu-Ray Disc, just because it makes more efficient use of current technology without having to invent (and go through all the try-and-error cycles of) new and advanced techniques.