So today I got the news that steam has just released Alien vs Predator 2000 classic. I loved this game, and I think I might hold off to see if GOG will get the same game or not. I'm relatively new to GOG though, so does anyone know if this happens very often if at all? (Where a game comes out on other digital distribution platform and then is released on GOG).

More than likely, but making any sense of the way GOG has been operating over the past months has been an exercise in futility.