Three points ;
1 - If this was true, then KISS Inc would have bragged about it weeks ago. They always announce the product, not the producer. Since when do "lawyers" release pinball news..
2 - KISS will want full control over the use of their music and images. So designers will be given the back seat. So I can't see this EVER working out.
3 - Original members on the game = massive seller. Cover band members (current line up) = lowest selling Stern title in history.
Until it comes from the KISS camp - it is another BS rumor. Garry Stern can wish all he likes, it won't happen.