Sure, the new iWork suite has removed quite a few features that was otherwise available in the old version. But it might only be temporarily.
The new version is rewritten to revisit and enhance the suite of tools going forward, but it has made it necessary for Apple to not include all features at first launch. That's why the old version was not overwritten when the new version first launched and presented as an update in the App Store.
Much wanted features like Apple Script support was only recently reintroduced, and details like the one you mention here might also come in a later update.
Until then, consider using the old Keynote(it still works on Mavericks) if you can't do without this feature. Personally I do not fancy these "bullet reveals" during presentations and would encourage you to try out some new styles of presentation to keep an interest in the lecture. The best lectures are usually built on a solid written and rehearsed and slides that are build to enhance it even further.
Some book recommendations to that end: