At this point, I'd rather speculate about it's competitive ability and it's movepool rather than it's type. .___. That's something that I feel would greatly interest me, but sadly that isn't going to be revealed for a while. xD
The only problem there is that it's extremely difficult to speculate on that until we see it's typing =P I mean, we know it will generally have the same moves that all the Eeveelutions tend to share, but what usually sets them apart is just stat distribution and type-specific moves/abilities. It definitely would be more fun to speculate, but the two things kind of go hand in hand.