Young Ace magazine revealed in their July issue that they’ll be serializing a manga adaptation of Steins;Gate 0. The game, produced by Tatsuya Matsubara and a myriad of other writers will receive mangaka Taka Himeno (also known from Grisaia no Kajitsu: L’Oiseau bleu). The first issue will appear in Young Ace’s September issue which comes out August 4th for inexplicable reasons.
The manga will be a prequel to the game Steins;Gate which leaves speculation as to when it exactly it is set. Steins;Gate 0 is supposed to take place immediately after the conclusion of the plot in the original Steins;Gate thus it is likely the manga will prequel the story in the games as whole.
Steins;Gate 0 released in 2015 in Japan, coinciding with the anime adaptation which follows the plot of Steins;Gate (albeit with a different route towards the plot’s conclusion). In the meanwhile an anime adaptation of Steins;Gate 0 is also given the go ahead.