I played the prototype almost a year ago and it was fairly complete. The night mode was already in there and it was mostly clear what needed to be done as far as shots. There was one mocked up ramp in the upper right that felt very steep and the shot was hard to make.
They said they already had the rights to the theme and art at that time, which I figured was a huge hurdle for a relatively small project. I think these guys update from time to time on Pinside. The thread is huge and I don't really keep up with it.