Bayonetta 2 is set to feature an online cooperative play mode called Tag Climax as part of it’s game. You would be forgiven for not having a clue what this is as to be honest this is the first time I have heard of it, this is the god thing about Nintendo they have provided a fact sheet about the game and the following gives detail to this mode:

In online quick matches, you can wager halos, the in-game currency that you
earn by defeating enemies. You receive a large sum back if you can prove
you’re a better fighter than your partner. Halos can then be traded in a story
mode shop to unlock new techniques, buy accessories and pick up alternate
weapon variations.

So do you like the details given, if I find out more I will be sure to report them here.