We are weeks away from Nintendo’s E3 Direct and one game that has been rumored for months since the Switch was revealed was the Mario + Rabbids crossover game which is Mario + Rabbids Kingdom Battle. An image had leaked that is supposedly a part of the cover art a while ago but the original tweet was deleted.
https://twitter.com/FatalFlowey/status/867054937611653124?ref_src=twsrc%5Etfw&ref_url=http%3A%2F%2Fcomicbook.com%2Fgaming%2F2017%2F05%2F23%2Fmario-rabbids-kingdom-battle-confirmed-key-art%2F
Well Liam Robertson who is one of the better Nintendo insiders has spoken to his sources at Ubisoft and obtained the full artwork for the game:

The long-rumoured strategy RPG, Mario + Rabbids Kingdom Battle is currently scheduled for release in August and is set to debut at E3 in June