https://www.gamespot.com/articles/e3-2018-metro-exodus-makes-big-strides-into-a-more/1100-6459755/

Coming into Metro Exodus, there was a strong feeling that the series was building up to this moment. With 2010's Metro 2033 focusing on the exploits of Artyom in the bleak underground society of post-nuclear-war Russia, and its follow-up Last Light expanding its scope even further, Exodus ups the scale of this world in a more pronounced way.

The developers at 4A Games have been rather quiet about Metro Exodus after revealing it last year, but just prior to E3 2018, we played about an hour of the game and spoke to the team about the evolution of the series. With Exodus fleshing out the survival-oriented gameplay, while sticking close to its methodical combat, the next game exhibits potential for a more freeform experience, where open-ended exploration presents players with the freedom to approach challenges as they see fit.