Depends on the publisher, in this case 2K. So far no game from 2K was connected yet. If they jump on that marketing train, I think it's more likely they would start with older releases they already had multiple time on sale, like the Railroad Tycoon or X-Com series.

2K games on GOG: https://www.gog.com/games?sort=bestselling&search=2k&page=1
Connected games so far: https://www.gog.com/mix/gog_connect_games?ccr=y