Dammit, that animation is sweet! The question is, was it intentional, or just a result of Euphoria (the same procedural animation used in GTAIV)? Either way, it makes me more excited to play this game. Nuanced, exciting and varied hand to hand combat is so hard to find outside of fighting games, and sometimes hard to find there, too.
On that note, it was really disappointing that Volition cut a lot of the hand to hand fighting animations from Saints Row going from 3 to 4. But I guess they did the same thing going from 2 to 3. I really miss the katana animations from 2. They would have spiced things up a bit with the energy sword in 4. That, and the beatdown moves (pressing L2/Left trigger right next to someone) from 3 would have been great to have in 4, especially if they suped them up a bit due to superpowers. The superpowered sprinting moves are great, but only being able to use them from a sprint is a bit of a drag.