New features in Keynote 4 require Core Animation

MacRumors reports that the Keynote presentation Steve Jobs presented at MacWorld San Francisco was based on the version 4 of Keynote. The Keynote reportedly included some new transition based on Core Animation, one of the big new feature in Leopard. This could explain why iWork '07 hasn't been released yet as most of the new features seem to be dependant on the new 10.5 operating system.