https://www.gamespot.com/articles/e3-2018-new-mario-rabbids-kingdom-battle-trailer-s/1100-6459708/

Mario + Rabbids Kingdom Battle had a surprise appearance at Ubisoft's E3 press conference. Ubisoft announced that the game would be getting a new Donkey Kong-themed expansion called Donkey Kong Adventure.

Donkey Kong Adventure brings more characters, enemies, levels, and bosses to Kingdom Battle. A new trailer, accompanied by a live musical performance, detailed how Mario and company come to meet Donkey Kong. Once he joins the heroes' quest, the group quickly runs into friendly Rabbid characters as well, each one dressed as a different DK character.