To me this reads as Stern had a lot of unsold Munsters LE playfields. It was super weird that they made the LE the color and the Premium the black and white, and then later increased the LE from 500 to 600. Their sales projections must have been all over the place.
The Catwoman version is kinda cool though. I wonder if they'd do a Joker/Riddler/Penguin version, but I sorta doubt it. Maybe a version that more prominently features all the major and minor villains? Batman 66 is a great game and the license must be dirt cheap. Stern will make it for years.