With ng-animate, angular completes the circle of defining HTML DOM behavior in a pure declarative way. I can't wait for this to go to the stable branch.
If you don't have a specific reason not to, I'd highly recommend using the unstable branch today. I've had no problems with it since I switched several months ago, and any breaking changes have been pretty well documented in the release notes.
This will allow for drop-in animations (like animate.css, mentioned in the deck) in the same sort of way that bootstrap allowed for drop-in styles.