Thanks to one dedicated Ghibli Freak, I've managed to find many screen shots of the Studio Ghibli films in high in high resolution. These really look spectacular, certainly far larger and more detailed than what's available on the traditional DVD format. This should really give you an idea what to expect from future Blu-Ray discs. Click on the photos to see them in their full size, and you'll see what I mean.
Naturally, I thought the best candidate would be Ponyo, since that's the movie we're all looking forward to. For a movie set at an ocean location, there is a terrific variety of colors and textures on display. Kazuo Oga's background paintings are simply spectacular, almost a watercolor stencil look. He and the Ghibli artists have really outdone themselves this time; I'm almost at a loss to wonder how they will top this. But Miyazaki is already planning his next feature film, so we shall soon see.