The Cyberpunk 2077 release date has not yet been officially announced, but it was accidentally announced by one of CD Projekt's partners.
Turkish publisher Bilkom posted a message in Twitter saying Cyberpunk 2077 will be released in 2019. Of course, this tweet was deleted soon after.
Note that Bilkom was engaged in the release in Turkey of another game from the Polish studio – The Witcher 3, so the information disclosed by this publisher has every chance of being true.
The RPG Cyberpunk 2077 was announced back in 2012. It is known that it will be released on PC, PlayStation 4 and Xbox One.