This is the first brand-new Splatfest since the final Order vs Chaos one (if you don't count the reruns), I'm assuming Pearl will be Team Mushroom, and Marina will be Team Star.
Special Mario themed keychains will be coming to MyNintendo Rewards closer to the Splatfest and later today you can buy t-shirts that will match the ones in-game. Like the ones for Chaos vs Order, they'll probably sell out really fast.
The tshirts should be available from Nintendo's Online Store later today
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