An anime adaptation of Steins;Gate 0 was revealed way back when 5pb. first announced the game, and now production is officially underway. The Steins;Gate 0 anime is one part of the Steins;Gate World Line 2017-2018 Project that Kadokawa discussed at Anime Expo 2017. While we don't have a date for the project outside of the initial 2018-2019 projection, Kadokawa shared a promo and a new key visual.
Other Steins;Gate 0 plans include a manga adaptation by Taka Himeno—set to debut in the September issue of Young Ace magazine on August 4—and a novel adaptation. The latter will be released as part of the Sneaker Bunko line from Kadokawa.
Finally, the original Steins;Gate anime will be returning to TV in Japan this October in the form of a rebroadcast.