Rumor: Ubisoft had internal concept of Mario and Rabbids adventure game during the Wii era
Mario + Rabbids Kingdom Battle should finally be announced at E3 this week. Before that game existed though, Ubisoft apparently had interest in mashing the two franchises together during the Wii era.
It seems that a formal pitch was never actually made to Nintendo, and it ended up as nothing more than an internal concept at Ubisoft. Nintendo may have shut things down before talks ever progressed in the slightest.
Liam Robertson has the full report on the concept below.