THQ Nordic gave no explanation for the delay, but with the reported size of the game, it wouldn't be surprising to hear that it simply just needed more time in the oven.
Metro Exodus will now launch on PS4, Xbox One and PC in early 2019.
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It has nothing to do with THQ Nordic, but it does at least have an official release date... of 2021. In sad news for anyone looking forward to braving the irradiated cruelty of post-apocalypse Russian Federation, that's now slipped roughly six months to the first quarter of 2019. The announcement of a third game in the series was somewhat of a surprise, given that both 2033 and Last Light remain somewhat niche titles in their own respects. Games like Nier Automata saw a release in March as extremely well timed as opposed to the hustle and bustle of the Christmas rush, and even Sony has start putting its big hitters in the same timeframe.
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". For the first time in the Metro series, Exodus will feature an open world. Players once again assume command of 26-year-old Artyom, who teams up with the Spartan Rangers to escape Moscow and head off to the far east. Apparently, the owners of Metro: Exodus chose the second tactic.