According to the latest info I've received from Winradio, production has now started and they are awaiting CE certification.
Interestingly enough, the preliminary spec sheet has been revised. Minimum selectivity is now 10 Hz instead of 50, the resolution bandwidth within a DDC spectrum is now 1 Hz and not 15, and most important for me, sensitivity figures have been upgraded from a mediocre -94 dBm to a more acceptable -101 dBm (AM, 30 % modulation).
"It will be on sale shortly", Winradio claims.
Its GUI has been slightly changed too, as can be seen on the pictures above. Above is the January version of the GUI, below is the current one. Not bad at all. The displays are fully zoomable and the DDC can be displayed in a separate window.