Cube World will finally be released in 2019, in around October and November, six years after its initial public sale of its alpha version back in 2013, the developer Wollay have announced via his Twitter page.
Cube World will be released on Steam! https://t.co/Lap10eQVKX
Hopefully around the end of September/October 2019. #cubeworld— Wolfram von Funck (@wol_lay) September 6, 2019
And yes, to those who bought the game in its alpha state back in 2013 will be receiving a Steam key, as the developer mentions in a different Twitter post, most likely from where they originally bought it on the Picroma website.
Yes, owners of the alpha will get Steam keys.
— Wolfram von Funck (@wol_lay) September 6, 2019
When available, you can buy the game on PC through Steam on the game’s page.