So been trying my best, and I think I have a compilation of what we will and won't have? Some bits gathered by the help of others; but this seems to be the strongest notion.
Ground-Floor:
- Princess Peach's M&G (Next to Peaches Castle)
- Character Stage for Mario, Luigi, and Toad (Center of Ground-Floor)
- Goomba Crazy Crank (Next to One-Up Factory, one of the Key Challenges)
- Piranha Plant Nap Mishap (Next to Exit, One of the Key Challenges)
- One-Up Factory (Gift Shop for Mario Kart: Bowser's Challenge)
- Restrooms (In-between Toadstool's Cafe and One-Up Factory)
- Toadstool's Cafe
- Koopa-Troopa Power Punch (Next to Bowser Jr's Challenge, One of the Key Challenges)
- Thwomp Panel Panic (Next to Toadstool's Cafe and the Mt. Beanpole entrance, One of the Key Challenges)
- Exploration Chambers (Two locations. One to the right of Princess Peaches Castle, and one next to the exit of Super Nintendo World)
- Bowser Jr. Shadow Showdown (Earn Three Key Challenges to unlock the ability to go and face Bowser Jr)
As guests head to Mt. Beanpole, there is a sign that is not the proper entrance sign for Mario Kart: Bowser's Challenge, but is a directional that points to where people need to go.
Upper-Floor:
- Mario Kart: Bowser's Challenge (Entrance on Second Floor, exits down into One-Up Factory)
- Underground Maze (Shrinking maze seen in the Osaka Nintendo Direct)
- Binocular Stand (Left Side of Mt. Beanpole as you go up)
Unknown in positional, but we do have a Yoshi's Island experience that seems to be multi-floored and potentially unique to the Universal Studios Hollywood park. I do not think this is Bowser's Challenge Extended Queue. As for what we don't have...
- Yoshi's Adventure (The Omnimover Dark Ride)
- Mario Motors (That was the gift shop for Osaka and Orlando's Bowser's Challenge)
- Bob-omb Kaboom Room (Would've been connected to the Shrinking maze)
- Slot Machines
- Yoshi Snack Island
- Pit Stop Popcorn
- Note Block Rock