Some people think that Eevee's latest evolution mechanic will be gender-based. Female Eevee can evolve into Ninfia by some odd means, and male Eevee can evolve into a blue masculine counterpart. This theory isn't total bullshit, but there has to be a second step to take. Your Eevee would need to hold something or level up near a new rock as a second requirement, but Pokemon's about choices and low requirements. Male Kirlias can become Gardevoirs if the trainer just wants a Gardevoir regardless of gender, so one would be pretty hard pressed to support the claim that Game Freak would continue to make separated gender-based pokemon in such a manner. The only time they had a boy and a girl as separate pokedex entries in the same season was with Nidoran. It doesn't seem likely they would do that again. I imagine that obtaining a Ninfia would require a hold item. I'll leave it up to the Eevee short to show any indication as to what an Eevee must undergo before evolving into it's eighth choice of evolution. Also, the more I look at it, the more concerned I get with its face. Compared to the others, Ninfias nose looks a little...smashed in. This is more of a comparison to past artwork of the other Eeveelutions, since they're all facing the front in that movie ad on the left page. I wouldn't count on anything just yet. The text there is overlayed on top of that black stuff as if it's trying to stand out in its own little corner (like a black firework) while talking about the Eevee family. It might be saying something like, "Up to B2 and W2, we've had these Eevee evolutions!!