When Apple released their latest version of Keynote (version 6.0), there were a LOT of changes to the software. Not just the software itself, but the entire Keynote ecosystem (for more info on that, click here).
When you look at the upgrades to the software itself, one of the most significant improvements is in the object animations and slide transitions (these improvements were mentioned and demonstrated during Apple's keynote presentation on launch day). What's different? Specifically, a few new animations and transitions were added, and all of the pre-existing animations were recreated from the ground up to be more accurate in their physics and motion.
When you have a few minutes, if you haven't done so already, I would strongly encourage you to fire up the new Keynote and try each of the new object animations and slide transitions. My favorite are the "Object Effect" slide animations. It's no wonder nearly all professional presenters prefer Keynote over PowerPoint.