XCOM 2 transports players 20 years into the future, where humanity lost the war against the alien threat that has established a new world order. The secret paramilitary organization known as XCOM is largely forgotten, and must strike back to reclaim control of Earth and free mankind from the aliens’ rule.
In XCOM 2, the roles have been reversed, and XCOM is now the invading force. They are hampered by limited resources and must constantly evade the alien threat in their new mobile headquarters. Players must use a combination of firepower and stealth-like tactics to help XCOM recruit soldiers and build a resistance network, while attempting to expose the evil alien agenda and save humanity. XCOM 2 will introduce gameplay features such as procedurally-generated levels, which will make each experience unique to the player, as well as offer a much deeper level of modding support. Additionally, XCOM 2 will offer a variety of new content including five updated soldier classes, increased soldier customization, more alien and enemy types, evolved tactical combat and more.
Source: The Game Website.