A rumor on a rumored game. We know how silly that sounds, but the sources out there backing up the Mario + Rabbids Kingdom Battle rumor are, in my eyes, credible enough to believe.
With that said, we're also hearing multiple reports (outside of AND including the video above) that Mario + Rabbids Kingdom Battle will be using Ubisoft's Snowdrop engine. That's worth noting, as both The Division and South Park: The Fractured but Whole use the same engine. If this rumor is true, it's great news to hear Ubisoft has gotten one of their major engines up-and-running on Switch.