Belinda's shortsword?
It would be nice to have a katana for some asian themed characters or maybe a chinese dao/jian. From what I know, the quetzal weapons that the tengu in auric basin use are exactly this (they have a katana sword and wakizashi dagger skin). So technically they could add them in, but maybe they can’t atm since they have no lore reason to add it.
The closest thing to having a katana in game atm I think is the mordrem saber, ceremonial sabre, or the augury of death if you are fine with those.
The quetzal weapon codes have been datamined but as Wynn notes they may exist just for the NPCs even though we can preview them.
I know I really want them (I like real-looking weapons), so as long as they aren’t a raid reward I will do what I can to get them if ever they show up.