I'm a little surprised. Glaceon is the girliest of the eeveelutions up until Sylveon, what with her Zoe Deschanel bangs and diamond dust hair tendrils. However, one could have a male Glaceon if they just wanted to have one. That being said, it shouldn't stand to reason that Sylveon would be of one gender, even though it's supposedly based on sylphs. Let's consider Silphymon, another popular sylph monster. He's got pecs underneth a very masculine looking breastplate, but the point of inspiration is the feminine wind elemental, the sylph. Other monsters in the video game world have broken traditional gender rules that follow their inspiration before, and Pokemon hasn't been an excuse either. Now if Sylveon WAS a female-only evolution and Game Freak invented a male specific one (at which point I would stop bitching about it being a dumb idea), then it's my theory that, as a pair, they would be partly based on aeons as well. Aeons in mythology (or was it theology? Eh.) are spiritual entities that exist in pairs; one male and one female. Latios and Latias were the first to be based on aeons, so if they wanted to make another aeon pair, gender-specified Eeveelutions would be a good excuse. Also, another thread of logic nobody's tried putting together is that the yellow squiggly lines attack that Sylpheon uses could be Roar, Growl, Screech, or a new sound-based status attack. As I remember, in the past 3D games, Pokemon didn't switch into a battle animation when they weren't using a damaging attack. They may use the same damage-non-damage defining visual trick this time around as well. Finally, Sylpheon is SO OBVIOUSLY the Vegas-type. It attacks with a firework, a card trick, a laser light show and a bunch of glittery star props. Only in Vegas(and/or Monte Carlo)!