I'm agreeing with Mirko, I see a light type coming in. The rainbow in the background might be a clue to that. Although I must say it looks adorable, it seems to be going in a new direction for Eevee designs in the past. Not that it's an entirely bad thing, just something new for the new generation of designs.
Whatever be it, I don't think it's going to be an already existing type, for the simple fact that it wouldn't make sense to hold off the type info otherwise. They want the new type announcement to be bigger/at a later time.
I thought it was flying, though that didn't fit with the whole eeveelutions being special types thing. But love sounds like a special type and that would make loads of sense. Though, if infatuation becomes more common in this game, I'll be pissed. It's the most annoying status.
Exactly what I was thinking, what would the strengths/weaknesses be to those types? And true, light and psychic would be similar. I highly doubt this, but I read someone saying that the bows might be butterflies and it's a bug type xD
If it was light, I'd see the type as 2x on both ghost and dark, as well as 0x on grass and steel. This would also mean that sableye and spiritomb would no longer be without weaknesses (and do remember, psychic is 0x on dark), but with a 4x from light. Quite game changing, since there has been a huge rise in sableye usage since it got prankster.