According to Reuters, Disney currently plans to develop original content for Blu-ray. These short films will be shot in high-definition and will accompany films the company plans to release in the Blu-ray format.
Raising the bar in the Blu-ray Disc vs. HD DVD battle, Walt Disney Co. is creating a series of short films to be shot in high-definition to accompany select films the company will release in the Blu-ray format.

It's the first move by any studio to develop original content for the Sony-developed Blu-ray, a step observers feel is critical to giving the format the upper edge over Toshiba's rival HD DVD.
Disney's Blu-ray titles are expected to begin shipping on September 19th and will come in two waves. Out of the initial nine titles, five of them will come with the exclusive shorts. More information can be found here.