Penguin's CEO, John Makinson says:
"We will be embedding audio, video, and gaming into everything we do. The .epub format, which is the standard for ebooks at the present, is designed to support traditional narrative text, but not this cool stuff that we're now talking about. So for the time being, at least, we'll be creating a lot of our digital content as applications, to be sold on app stores, in HTML."Watch this amazing demo of Penguin's offerings on the iPad.
Found via Fast Company