Here is an overview of the game, via Nintendo.com:
Tackle, Pass, and Score in Battle Soccer with the Mushroom Kingdom Gang
Introducing Strike, a five-on-five, soccer-like sport with no rules—do whatever it takes to win! Get gritty and try to score the most goals by tackling enemies, using items, and pulling off score-boosting special shots. Super Mario series mainstays like Peach, Toad, and Yoshi put their cleats (and stats) to the pitch and will stop at nothing to score. Customize your characters with gear that can augment their stats and appearance. Take the carnage online* or pass the ball to players locally—just look out for the electric fence.
Join an Online Club to Push and Shove Your Way up the Ranks
Band together with up to 20 strikers online and compete against other clubs for points. Find the right club for you, team up with friends, and bring your own striker style to the table. Strive to become the world’s top club each season!
Pummel the Pitch With up to Eight Players
Eight players can go for the goal on one Nintendo Switch system, with local wireless, or online. Bring along a secondary striker on the same system in online battles, too. Locally, four players on each team can go cleat-to-cleat in individual matches.
Watch the announcement trailer below. View the first screenshots at the gallery.