Chalk this one up to "yeah, we kind of assumed this is the case because there's no way the planned first-half of 2018 release was happening". Announced on Microsoft's E3 stage last year alongside a rather impressive real-time demonstration, Metro Exodus from Deep Silver and 4A Games has a new release window of Q1 2019.

With the studio noting,

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.

So then, we should probably expect to see a new slice of Metro Exodus gameplay as part of Microsoft's E3 showcase running on Xbox One X hardware. If it's anything like the last look, expect to be thoroughly impressed with the new expansive open-world action-survival approach to Metro.