Well it isn't the first time we've had a Pokemon with an inflatable flotation sack around their neck
With could-have-been budding wings and two tails perfect for Sonic logic, it seemed more Flying-type than Froakie but they took it in a pure-water direction.
I attribute bubbles and foam to water more than anything else so, while I see why you'd go with Flying-typing, I couldn't imagine it actually going that way.
Starters have always been pretty impossible to call. Who would have guessed Charmander would sprout wings, Torchic would grow into a Kung Foo chicken, or Tepig would become a bipedal sumo? The starters never tell anything of their evolutions aside from Gen 2's boring "bigger versions" for all 3 starters.
I should had been specific enough earlier to elaborate: Rock-type attacks = not very effective VS Water-types, with the aforementioned reason.
Should Honedge not get Levitate as its 2nd Ability, Heatproof is acceptable. Besides, Japanese ghosts have some sort of mythological affinity with Will-O-Wisps, no?
It's gonna get Light Metal, don't even kid yourself. The weightless Ghost in a small sword is going to get Light Metal. Rotom-Fan will be proud.
But on a more serious note, I would settle for Mummy with that creepy arm but I'd put money down on it getting Infiltrator instead. Cut right through those defenses. Unaware would be awesome but Game Freak would have to feel really generous and so far...well...
The Pokemon with No Guard shows off Aerial Ace as one of its first moves. This is shaping up fantastically for Honedge. He's got a shining
RU UU career ahead of him. Assuming he gets a move with more than 60 Base Power and UU stays a fighting-type paradise (altho I can see current UU becoming Gen 6 RU).