The all new game of the series is set to release the game to the worldwide market by the year 2020. Read more here.
Check: GTA 6 Release Date
Game is going to have a very high graphics and as per the graphics high end system is required.
Check: GTA 6 System Configuration
The next part will be launching in all platform (PlayStation or Xbox or Windows), but in a sequence and PS5 console for the game.
Check: GTA 6 PS4/Xbox/PS5