I'm not sure if you're talking about the Tengoken Heavy Blade skin or I'm just uninformed and there supposed to be a longsword one, but the aforementioned skin has been available for a long time.
Cool, I've been waiting for some of these Tennogen items. On another note... I wonder if this will get fixed this time: This bug has been there for (at least) 4 updates now and it's still a thing. Not a huge issue, but annoying nonetheless.@[DE]Danielle Can you please look into it?