We already knew that Leopard would be a major new OS release for Apple in the visual sense with Core Animation, much as Tiger was with Quartz Composer, Core Video, and Core Image. We should know a lot more at Apple’s developer conference in June. There are some additional details in Apple’s latest WWDC announcement, under “Leopard Innovations”:

1. Core Animation to add elegant animations to your application interface.
2. iChat Theater to incorporate application content in iChat.
3. QuickLook to provide system wide previews.

Core Animation is old news, but could this mean you could add iChat streaming to an app? And system-wide previews are also badly-needed.