I was just about to post a question about the next OSC release and then noticed The Swarm is listed for pre-order on Amazon (August 2, 2016).
I remember reading in an interview that OSC's publishing pace was probably going to slow down as he tries to take better care of his health. It seems like this has been realized, OSC's normally frantic publishing pace has certainly slowed. Hopefully this means OSC is emphasizing care for his body and is able to enjoy the fruits of those efforts.