This article claims only a dubbed over (audio) and patched together (scenes) has ever been seen. Further, it claims the trailer appears to be about something entirely different..... what I mean is scenes from something else patched together and audio dubbed over the original and pieced together to appear to be something entirely different. Interesting article. It wouldn't surprise me if a muslim did it so they could claim persecution and give them an excuse to raise h@ll.... as if they ever needed one... they do it all the time.
http://beforeitsnews.com/conspiracy-theories/2012/09/anti-islam-film-never-existed-2444628.html