I guess this kinda flew under the radar, but this shows the ride vehicle shown for the ride and concept art:
Shanghai Disney Resort has announced that a brand new Zootopia-themed expansion featuring a state-of-the-art attraction
tdrexplorer.com
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Now you can argue this could still be either an EMV or trackless, but I'm leaning a lot more towards a trackless. Notice how there is one big long lapbar like Runaway Railway on each row? If it was EMV, we'd see seatbelts.