Yep, I would go with brawl. I suspect it's missing because if we are being honest with ourselves, nobody really trains to fight with candlesticks, mops, tablecloths, barstools or salmon. They just grab it and heave to. (OK, Jackie Chan but he is the exception). And if you are not learning, no point in a skill for it. Theoretically, it could default to how you approach the action. Grab a mop and use it like a staff may be Weaponry, slap them with a herring and it might be Brawl. Throwing it is Aim. Clock someone from behind with a vase and it could be Hide.

Um...didn't they remove the categorization from Weaponry?  So you no longer have to distinuguish between Weaponry (Dagger) or Weaponry (Sword)?

If so, they it's completely open to Improvised Weaponry.  What you can't do is use your Duelist manuevers with an improvised weapon.

That is until someone converts the Improvised weapon swordsman school (don't recall the name).  

Just from the description, I'd say Weaponry covers bottles, tables, chairs, hooks, billy clubs, pretty much anything used to bash, slash, or poke.

Note that the Bar Fighter advantage says "You gain 1 Bonus Die when you make a Brawling Risk to fight using an upturned table, a barstool, a plank of wood, or some other improvised weapon."  To me this implies that improvised weapons normally use Brawl.

I fully agree that it isn't really something that you "train" in doing, which is why I'm not surprised to see it not it's own skill. I was more nothing the fact that descriptions of the skills themselves in the preview don't really mention using an improvised weapon under either skill. I was going with the assumption of Brawl because specifically because it's not really a "trained to do it" sort of thing.

I'd say Joachim's discovery under Bar Fighter helps nail it down a bit. Pretty clear that the intention for improvised weapons is to put it under Brawl.

I would probably have my players describe how they are using the improvised weapon and decide on skill from there. And if they switch from using a chair leg as a club to stabbing a guy with the sharp broken tip to throwing it, well, it was already a pretty improvised attack already.

I may ask them for either a hero point or an extra raise on the first use, but it will generally be that improvised weapons are based on what the person is doing.

Then again, juggling swords would be perform, not weapon, right?

Juggling swords... Well, I guess it depends on why. To impress or to hit a guy in a fight with 3 swords.

It's basically sword dancing as found in a number of other RPGs, possibly closest to Yael from 1e.