Ironically the Kickstarter has likely backed them into a corner.

I do think they roughly have a date, but they're keeping it very close to their chest. However the kickstarter, the thing that's made this entire game possible, is likely what will cause the actual leak that gives us the release date. I have to assume they're going to ask backers their preferred platform for a code, and I don't think every single backer is going to keep that information hidden.