The press release is worded rather interesting, with the PR noting that Deep Silver has been "keeping an eye" on the announcements from their competitors and monitoring the release windows for when other FPS games will launch.
Deep Silver, at the conclusion of it's statement, did state that more of Metro: Exodus will be shown at E3 including "some brand new gameplay from a never before seen game environment for [players] to enjoy".
Metro developer 4A Games and Deep Silver, the publisher of Metro Last Light and Metro Exodus, acknowledged in a joint statement that the delay was "disappointing news" for Metro fans but said that Metro Exodus' development was still going well.
If you're experiencing any déjà vu at the news it's probably because S.T.A.L.K.E.R. 2 was already announced back in 2010, but GSC Game World went bust before they had time to finish it.
Originally announced previous year, (and rumoured long before that), Metro Exodus, developed by 4A Games, will bring the series penchant for grim, claustrophobic locations and grotesque post-apocalyptic creatures screaming to the current generation of platforms.
For those not in the know, Metro Exodus is the third entry in the Metro series whose first entry, Metro 2033, debuted on the Xbox 360 and PC in 2010. It gives players more breadth to move around the world above the Metro, which takes a lot more design scrutiny and testing. Furthermore, there is still the promised we can look forward to in a few weeks at E3 2018.