From the video description:

Welcome to the WarZone! BATTLECRY, a 32-player online team action game, is the first project from our Austin-based team, BattleCry Studios.

Step into a bold, expressive world envisioned by Viktor Antonov (Half-Life 2, Dishonored) where gun powder has been banned following a cataclysmic world war at the dawn of the 20th century. Traditional warfare is now a relic of the past and all conflicts are settled head-on by elite teams of chosen warriors in sanctioned WarZones. Trained and bred for battle they face off for the glory of their nations.

Get more info here.