ka1man; It was also mentioned in the comments for the latest blog post that there is an OpenGL build for Windows, as well, but Swen wasn't familiar with the details and thought there were some problems with it. Assuming those issues can be resolved, that may potentially remove the requirement for a DX 11 card in Windows.
d10sfan; That was after it was revealed there would be an announcement very soon, which would include information about the Linux version.
Ok, like I said, I asked for a refund at that point, because you said it was possible. As far as I knew at that point, that soon could be much later than it was. This was before the annocument was made about the extended edition. With the wording, for all I knew, it could have been cancelled.