The video above was taken by IGN at PAX 2016, and shows off the only map playable in the mode at the show. The gameplay introduces a new device called 'The Fabricator' - a device not dissimilar to a real-world 3D-printer. This can be used to convert points earned during the wave into fortifications and new weapons. There are now five different classes you can choose from in the mode, and the game allows class stacking so if someone's playing as that meaty tank you love, it's fine: you can always double up. Gears of War 4 is due out October 11th for Xbox One and Windows 10 PC. Source - X360A
