They seem to at least correlate with the shapes of the mascots. X for Xerneas and Y for Yveltal, which sounds like evil (and it looks pretty sinister IMO). It seems to be a simple, universal translation, which is especially good since they are working on localizing the games while producing the content for it for a worldwide/international release in October. It very progressive, convenient, and evolution (since this is about Pokémon).
Official Sisyphus of the Kingdom Hearts: Birth by Sleep Board Chances are slm to none at best