In addition to offering content with resolutions up to 3840x2160, the new format also "enables delivery of a significantly expanded color range and allows for the delivery of high dynamic range (HDR) and high frame rate content. Next-generation immersive, object-based sound formats will also be delivered via the Ultra HD Blu-ray specification." Ultra HD Blu-ray will have space for 66GB on dual-layer discs and 100GB on triple-layer discs.
Also of note, there will be a "digital bridge" feature that allows consumers to view their content on numerous devices around the home.
All Ultra HD Blu-ray players will also be backwards compatible with Blu-ray discs, so you don't have to re-buy your whole collection for the 20th time. Expect more availability news throughout the summer, says the BDA.