Bayonetta 2 will have a two-player mode, according to our own Hamza Aziz who is reporting a bit from a Nintendo event. Aside from the note that there will be a lot more aerial combat in the game in general, there wasn't anything else to report.
Start speculating! How will Bayonetta 2's two-player mode work? Will it be Wii U gamepad focused? Maybe it will be like Sonic 2, entirely apropos of nothing (I was playing it on my Genesis last week).