The Debian Edition experiment will be released in the days to come as an ALPHA. Why as an ALPHA? Because it is not intended to be used as your main desktop but to give an overview of what a Debian base would provide for the Linux Mint distribution.
The release will be targeted at IT enthusiasts only, in the form of a liveCD without an installer. The reason why there will be no installer is simply because it would require efforts and time to write one and it wouldn’t actually add much to the experimentation. The dev-team also wanted to focus on two other experimentations (a Fedora based ISO and a 64bit edition) and developing a liveCD installer seemed unreasonable at this stage.
The absence of the installer also means this edition can not be considered stable, or even beta, since some of its functionality is missing. A single ALPHA release is planned in the days to come and should be followed by the stable release of Daryna KDE Community Edition.