If its been said that we may see four experiences, it could go in this way of possiblilitys.
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With the amount of space being used for Nintendo, it could make sense that they want to thematically immerse you into the worlds that they're displaying. And if I was to make a list,
~Red: Donkey Kong family coaster
~Orange: Retail/Dining
~Blue: Mariokart
~Yellow: Yoshi or Captain Toad
It makes sense if they're planning on going with the Mario brand as you can create a mushroom world featuring Princess Peaches castle at the top right, a desert world with Captain Toad, a Jungle realm with Donkey Kong and with the orange, the mushroom village where you can taste food from the Mario series and shop for exclusive Nintendo merchandise.