If only we could tell you...
I know this, however, and I'm not revealing any big secrets by saying it. In this, as with other software projects, the program belongs to the development team until the so-called "Gold date", when it's turned over to the publisher.
What we turn over to Matrix on our "Gold date" is not a product that can be sold. After they get it, they build a proper installer, add music and all sorts of graphics, fix the documentation and what not, and only then can it be released.
We are all dreams of the Giant Space Butterfly.