I don't think it's any coincidence that the Shanxi province is one of the more polluted provinces in China.
They don't mention if this has been confirmed yet by anyone beyond just some photographs, so it could still be a hoax, there just isn't enough info in the article.
If it's real, that just getting some DNA from that cat could help scientists quite bit as those "wings" seem to be sprouting symmetrically. However, things just don't start sprouting out of complex organisms like cats.
I'm pretty skeptical of that photo, especially considering the angle at which it was taken. As you said, one wing-like appendage wouldn't be far fetched, but two symmetrical "wings"? Doubtful.