It's not fanfiction, it has a real poster and dolls.

When do you think they'll release a trailer?

Probably not too soon. They're working on It Takes Two.

You have to see this!

(I don't know who had edited it but I found this from someone who share to Facebook page.)

The first time I see Barbie Mermaid Power poster I feel it is so cute but since I see this. It makes me change my mind because it is so real.

Here's another pic of the poster without the extra text or fake Play button: