unfortunately, we cannot tell you an exact date.
Furthermore, we want to provide the open version in the future. The actual open source version is already a full usable software and corresponds to the high claims of the users.
At the moment we focus on the pro version to secure our long-term engagement for the support of the open version. If you like the new features, which are already released in our pro version, you can help us to promote the open source version by buying it.