I have no inside knowledge, don't take this as anything but pure speculation:
There was that 'joke' Deadflip Bill & Ted banner. We know Deadflip has been working on a 'homebrew' pin, and I believe with some form of help from Stern, or Stern parts, or something. It would not surprise me in the least if this was an art package for that game, and not 'the next Stern'.
I would be surprised if ZY actually leaked a Stern game like that, he knows people follow his posts and know what he does, and they're usually more secretive than that.
Just my thoughts. Teasers look great, looks like the kind of strong line work ZY is so great at, and it's a fun idea. Whatever it is, pinball or otherwise, be happy to see how it turns out.