Wave 2 of LEGO Dimensions should have Strawberry Shortcake, Magic School Bus, SpongeBob SquarePants, The PowerPuff Girls and a few more figures coming in 2016.
There's a place by the Octan tower and another one on a random street in Bricksburg that's just for Unikitty. You passed them in the video. They look very similar to the rainbow color jump-pad that all characters can use.
That's not the kind of rainbow thing that only she can do: anyone can get flung by the rainbow platforms. She must be the way to get to the previously inaccessible part in the Gauntlet part of the Midway level, though. I seem to remember a rainbow thing there. And, for better or worse, the whole idea of the game itself is the mixing of the worlds, so needing mismatched characters to complete tasks was always going to be part of the entire game.
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