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Because the higher-ups are putting an emphasis "???" on Sylveon's unknown typing, it's reasonable to believe there's a new type in the works. There were two types added in Gen 2, after all, but no new types were added since then.
Theoretically speaking, let's say that there is no new type in X/Y, and it turns out being a type that already exists. It caused all of this commotion over nothing, so to speak. With so many speculation of it's possibility of being any or even a new type, I wouldn't be surprised if there was a new type. But instead, let's say it turns out to be a Normal-type, since it's only been shown using those moves and an unknown move.
How would you guys react? Would you feel trolled?