Conspiracy theory mode: Activate
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Eeveelutions are introduced ever even numbered generation. Alola didn't have one because it was an odd numbered generation, but Galar is an even numbered gen.
The first Pokemon revealed for X & Y were the starters, Chespin, Fennekin, and Froakie. Then the legends, Xerneas & Yveltal. The very next Pokemon revealed was Sylveon, an eeveelution.
We already have the Galar Starters, so next are the legends. And if we're lucky, an Eeveelution will follow soon after.
But that's just a theory
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A POKEMON THEORY