Quoted from Wickerman2:
you have some inside scoop?
Isn't Jk Rowling on record with her displeasure of the history of pinball concerning it's gambling roots? She is unlikely to ever allow her sacred HP universe to be used for pinball.
Unless someone can change her understanding of pinball and offer her something grandiose, that's just the way it is. Not to put too fine a point on it but considering her net worth is over a billion dollars it's unlikely any feasible amount of money can get her to so much as raise an eyebrow at the notion.