Explore the Russian wilderness in vast, non-linear levels and follow a thrilling story-line inspired by the novels of Dmitry Glukhovsky that spans an entire year through spring, summer and autumn to the depths of nuclear winter.' 'Flee the shattered ruins of dead Moscow and embark on an epic, continent-spanning journey across post-apocalyptic Russia in the greatest Metro adventure yet. Here, check out the announcement trailer, which has a good chunk of demo gameplay:
It'll continue from Metro 2033 and Last Light and apparently get out into some lovely sunshine. 4A Games will continue their fun/grim post-apocalyptic adventures with Metro Exodus in 2018, publishers Deep Silver have announced during E3.