Updated: The developers have provided an official answer for the delay via Twitter.
We want everyone to experience the most ambitious Metro game to date at its absolute best. Therefore we've moved the release date to Q1 2019
We know this will be disappointing news for fans, but at E3 we will be revealing lots of new gameplay from a never before seen environment
— Metro Exodus (@MetroVideoGame) May 16, 2018
Original: In 2010 the world was introduced to one of the most unique and interesting FPS games we had played in years, Metro 2033. It was developed by Ukrainian developers (4A Games) and based on a novel by Dmitry Glukhovsky. The gloomy take on the future of humanity in a survival horror setting really set it apart from anything we had seen before. Events took place in the ruins of Moscow after a nuclear war destroyed everything. Those who survived would live, you guessed it, in the tunnels of the metro. Last year at the Microsoft E3 conference it was confirmed that the third game would be launch this year.
Unfortunately, this title has been shifted to the first quarter in 2019. This news comes via an investors meeting (you’ll have to use Google translate to read that). No reason was given for the delay, but we think it’s safe to say that a bit of extra development time has never hurt any game and that it would have clashed with some other big games like Call of Duty: Black Ops 4 and Red Dead Redemption 2 later this year, among other titles.
THQ Nordic acquired the rights for Deep Silver and the parent company Koch Media, who now own the rights to Metro Exodus. Unfortunately, they had no further details on other titles such as Darksiders 3 and Biomutant. With 2018 being so jam packed with games we think it’s a good decision.