Nintendo have said before that the possibility for cross-platform play between the upcoming Wii U and 3DS is certainly there with Nintendo of America's Reggie Fils-Aime assuring fans that they're "certainly thinking about it."
Speaking with Forbes, Reggie revealed that they have "one key developer with a very strong relationship to Nintendo" presently "envisioning" a particular title with cross-platform play in mind. The dev in question is the very same talent that brought the gaming world the Smash Bros. titles.
"The same developer who created Smash Brothers...is envisioning a Smash Brothers experience that will be cross platform between Wii U and 3DS," he said.
Reggie then added: "What I would say is our experience will likely be very different than what our competitors are doing."