A quote from Stern's Facebook page, from 8 hours ago:

"We are now only days away from the first ‪#‎Kiss‬ ‪#‎Pro‬ ‪#‎PinballMachine‬ gameplay video! Like if you want to see it now!"

Soon after Stern posted the a video of a test gig that shows what the magnet in the back does.  It is not on posted on youtube.

See:
https://www.facebook.com/sternpinball?fref=nf

That's a cool effect along the back wall. Have clicked like but really want to see le/prem - will have to settle for pro