User blog comment:Project Predacon/Volume 2: Post Credits Scene Analysis/@comment-3257939-20141030235329

There is nothing suspicious about looking exactly like your mother. In my hometown, people recognize me as "that lady's son" because my face is exactly like my mother's. Wouldn't it make more sense to think that Raven is Qrow's little sister?

Raven and Qrow - Bird names

Brawnen - Qrow's last name according to "that user" who called the name a year ago.

Hair like feathers - Judging by Qrow's silhouette, his hair looks spiny like Raven's hair.

It would make more sense to think that she is indeed Yang's mother. We don't have a reason to believe that she is not apart from coming up with theories like she's Yang from the future or some evil twin sister. Besides, it's obviously gonna be a topic in the afterbuzz and if we're lucky, they will tell us if she's truly Yang's mother or not. Let's just be patient.