In response to a question of mine on Kickstarter regarding a game to demonstrate the multiplayer functionality, they did say they were working on something, though I guess we'll just have to wait to see what it is. Otherwise, it would also be helpful for such functionality to be documented in the API so that third-party developers can attempt their own Link Cable multiplayer implementations. I probably wouldn't try to implement something so complex myself for my projects until I better know how to make games at all, but I have a few ideas for which the Link Cable might prove helpful.