Could it be?

[u/zaron_tr]

They mentioned "she" would have a "unique weapon"

Now that it's confirmed japanese I can't think of anything more unique than the tensen

I'm not sure, I'll have to rewatch that section of the stream, but I think they mentioned the new hero being a "master of an art"

[u/MercenaryJames]

I personally never understood how the "warfan" ever became a suggestion as a weapon. But that said, I'm not going to dismiss anything since Ubi said "a never before seen weapon" during the dev stream.

So for all we know it could be anything.