Release date(s)

Windows: Currently, there are no known release dates for the full version of the game. Though, upon entering the site, you can see a progress bar showing how far the game is from completion. The game will be released for Windows only first. The testing version of the game can be downloaded here.

Mac: It is definitely confirmed that Pokémon Revolution Online will come to Mac. There have been no production statuses released yet nor any release date(s).

Android: It is definitely confirmed that Pokémon Revolution Online will come to Android. The android version seems to be in testing and might be released along with the full version of the game, as Xhaj pointed out.

Linux: It is definitely confirmed that Pokémon Revolution Online will come to Linux. There have been no production statuses released yet nor any release date(s).