The introduction video of the close alpha was found in the preload files.
It gives a pretty clear view into what the game is going to be gameplay-wise.
Sign-up for the closed alpha here :
Back 4 Blood
Back 4 Blood is a thrilling cooperative first-person shooter from the creators of the critically acclaimed Left 4 Dead franchise. You are at the center of a war against the Ridden. These once-human hosts of a deadly parasite have turned into terrifying creatures bent on devouring what remains of...
www.back4blood.com
Edit : Video officially uploaded on Twitter.
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