Whatever her origins, it looks like Team Arrow will have to deal with that powerful canary cry, which the above clip even seems to show destroying that statue tribute to Black Canary.
EP Wendy Mericle has also said that Black Canary will always be a part of Arrow, so whether that means this Laurel or a new character, remains to be seen.
While there are hints of it in this trailer as well, a previous midseason clip heavily implied Laurel was not who she seemed to be.
Black Siren’s last-known location was the S.T.A.R. Labs pipeline prison, but barring some sort of escape, this is another way that Flashpoint may have changed Team Arrow’s reality.