http://www.pcgamer.com/mechwarrior-5-mercenaries-is-coming-december-2018-will-have-4-player-co-op/

During MechCon 2017 in Vancouver, Piranha Games president Russ Bullock took to the stage to announce that MechWarrior 5: Mercenaries, the return to a singleplayer sim-like MechWarrior, is coming in December of 2018. 

MechWarrior hasn't had a proper singleplayer game for over 15 years, but MW5 marks a return to form. When I visited Piranha Games in the summer, Bullock said that this would be "the same kind of action simulator that people have been wanting for 15 years." Ditching the linear campaign of the main MechWarrior games, Mercenaries will feature a more sim-like campaign where players run their own mercenary company and can explore the Inner Sphere and fight for its Great Houses however they like.