According to drummer Dave Lombardo, Slayer are working on new material. Jeff Hanneman is still recovering from a spider bit resulting in necrotizing fasciitis (this is fairly grim stuff) He has been had intense rehab since. They will not return to the studio until he has fully recovered.
Their last album, 2009 “World Painted Blood” was the first time they entered the studio with no songs or lyrics. Kerry King was said to be skeptical of process however was pleased with the results. No information is available if Slayer plan on repeating this.
The song “Psychopathy Red” was a single from “World Painted Blood”