I'd be really heavily frustrated if anything from the Twelve would end up in the cash shop. They have such a huge in game significance, I mean, you even pick one of them as your deity when you create a character. They are deeply ingrained in this world's lore since 1.0. Any of the hairstyles or other references should be available inside the game, with game content. I don't care if we only see them once a year or so at anniversary at an ingame vendor like the Make It Rain stuff, or if it is a sellable piece tied to hard content or a rare treasure dungeon drop. Wouldn't exactly be accessible but at least you could buy it on the market board if that's not your thing.

Personally I could imagine them putting it into the cosmic exploration thing, because there is at least some tiny connection between the Twelve and the residents of the moon, but relics sound like an interesting theory as well. (And both Bozja and Eureka dropped a bunch of hairstyles.)

And yet can see how the SE Board gets all shiny eyes from the chance of selling 12 hairstyles and what not in the mog store, all single character of course, because they just have to milk this cash cow game to the last drop. (Add some extra salt that these are likely to be able to wear by Hrothgar, as all of the new ones, who are already having a ridiculously small selection of hairstyles to begin with. Some are being added, with mixed results, but well...)