Any word if ws-15 will appear?
What, at the airshow?
No indications, and to be honest I don't think many people would expect it to be, considering the importance of the programme. The most public "appearance" WS-15 has made so far is on a chart from a few years ago with a small picture of what appeared to be an engine core, and that was it.
We may probably only see WS-15 at an airshow style event once it has been deployed fairly widely among J-20s to begin with.