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There is actually an event coming this season with a free katana! Finally right? 
It's called Sharpened Skill and it will be landing in the later half of the season.
Was there even supposed to be a free katana? From what I read, it's says we could use a katana in the gamemode (only) for free I have nothing against getting a free katana, cuz I don't have a katana but it's just weird
Technically no, but we saw all of the requests for it back in Season 3 after we did that mode you are referencing and have been trying to find a way to bring it to you all in some way or another.