A new trailer has been unveiled, as well as two 4-player gameplay videos featuring two game modes: respawn mode and identity crisis. (in videos section)
The gameplay videos are unedited, and show the gameplay as-is.
Within three weeks, there will be a support for up to six players. There's also other huge stuff coming then, like game modes designed for six players, and a fourth trailer to seal all the things up shortly after. Stay tuned!