It's still Pluto, but instead of being a planet, it's now an dwarf planet and has a small object number of 134340. The official name is 134340 Pluto.
Personally, I think this idea sucks... we all grew up with Pluto being a planet, right? So add a few: Ceres, Charon (the other object in Pluto's orbit making it a doubleplanet) and Eris (what was UB313, with it's new name...)
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