Could you elaborate on this? Have the devs said something about possibly cancelling the GOG release?
No, but they announced they were going to release the game here... then the release date came and went and still nothing, just silence.
My guess is it's because the game has been announced, was released on Steam in February, and the GOG release has since then been postponed without any actual news about it from Chucklefish.
... though since the game isn't actually on
GOG due to that, it doesn't quite belong on this list.
There are lots of games that aren't on GOG. This one is on GOG (release announcement, catalogue entry etc. but no files). I'd say that qualifies it. :P