User blog comment:Tadmonkey/Wii U/3DS Connectivity Characters and Stages Leak?/@comment-6137196-20141003134311/@comment-25129545-20141003211138

In one of the pictures of Wario, he's with Kirby & Ashley in an Animal Crossing stage, it turns out that stage is Smashville here's a video with evidence

https://www.youtube.com/watch?v=0m9JixVaPEc&list=UUfAPTv1LgeEWevG8X_6PUOQ