I'm sure they are hard at work, there's a lot to see if you search the web.
I think they're smart for not posting too much until it's perfect, making pinball is hard as we all know. So maybe they are working out the development. And they are also working hard to get all of the digital versions out as well.
It's a model we have not seen yet... Digital before physical, maybe silver castle has a good plan in place with this method