Those who participated in the demonstration were able to scan their bodies, which were then rendered as 3D avatars for the demonstration. Users were then able to manipulate their in-game avatar using a variety of hardware, including an Oculus Rift (Developer Kit 2) for head-tracking and VR visuals, Leap Motion and Ovrvision for hand manipulation, a Microsoft Kinect 2 for body movement, and special footwear to detect foot movement. The hardware was labeled "Nervegear Prototype." "Nervegear" is the name of the virtual reality hardware used by the characters in the original Sword Art Online story to interact with the game.
The beginning of the demonstration placed users in a "bazaar" environment, allowing them to test their ability to manipulate world objects. Later in the demonstration, users were able to fight The Gleam Eyes (from the 74th floor of the game in the original story), alongside three other users.
trailer
source: http://www.dualshockers.com/2016/04/15/ ... -gameplay/