Metro Exodus is being delayed into 2019. Publisher Deep Silver and the developer 4A games put out this joint statement:
Deep Silver and 4A Games would like to share some important information with you regarding the release date of Metro Exodus.
The development of Metro Exodus is progressing well; we are all really excited by what we are seeing. We have been constantly reviewing the games progress to ensure that we deliver a product that gamers and fans of the Metro series want and deserve, as well as keeping an eye on announcements from our competitor products. We want everyone to be able to experience what is the most ambitious Metro game to date at its absolute best and therefore we have taken the decision to move the release date to Q1 2019. We know that this will be disappointing news for fans that had hoped to play the game this year, but also know that you will appreciate the results that this additional development time and new release date will bring.
We would also like to take this opportunity to confirm that at E3 in June we will be revealing some brand new gameplay from a never before seen game environment for you to enjoy.
Thank you for your patience and understanding, we look forward to sharing more with you in June.
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
Metro Exodus is the third game from the series and will leave the tunnels and head out into the open world of Moscow. Expect more mutants, enemy factions, and don’t forget your gas mask filters because you’ll be dealing with a lot of radiation on the surface. Now would be a perfect time to check out the Metro Redux collection, containing the first two games; Metro 2033 and Last Light, if you haven’t already.