'XCOM 2' Goes Underground in a Future Earth Ruled by Aliens

XCOM 2, the just-announced follow-up to Firaxis Games 2012 strategy reboot XCOM: Enemy Unknown.
The reveal trailer shows XCOM forces — Earth's special, secret defense team meant to knock out alien foes — engaging the enemy in a crowded future-urban environment. Nothing about the world looks particularly bad or war-torn, but it's strongly suggested that there are more insidious plans in play.