Bayonetta 2 had a playable demo on Wii U, which was playable last year; it was shown at all the big expos and media events. You must have read a lot of previews of the game so far. But here you can see the whole thing in action.
This video was recorded by NiNTENDOMiNATi0N.
First Bayonetta was very successful with scoring of 87 on Metacritic. Bayonetta 2 will release Wii U later this year.