A new Binding of Isaac Rebirth trailer has been released today and it is hsowing off a new co op feature.
The co op feature is a very interesting one and requires you to work together. When a second player drops in they steal a chunk of player one's health. If a player dies they can only respawn if the other has spare health. In a game where dying happens a lot this will add a little extra stress to the situation.
Rebirth is due to come out on the PS4 and Vita later this year.