Considering there's a touchpad, there could totally be a ping system. I mean, seriously, just tapping a point and a show ping on the Wii U pad would make better use of it's touchpad, force people to look at the map once in a while and give a better advantage in communication.
For those unfamiliar, it would be something like poking the touchscreen for reasons unrelated to superjumping. Maybe holding L and touching the screen would highlight the area on the map for allies and also making a quick noise to get their attention.
I mean, bad teammates could still ignore it, but it seems useful and multipurpose to me.