Slayer’s Dave Lombardo has not ruled out working with Mike Patton in the future. From an interview reproduced at Blabbermouth, sample quote: “Are you still involved with Mike Patton? Lombardo: No, but that door has never completely shut. Me and Mike will work together in the future, I believe, if schedules permit. He’s great, I love his music, all of the stuff that we’ve done. There’s always a chance.”
I stumbled upon this old interview with Mike Patton from Raw magazine on 27 June 1990. Sample quote: “I think I’ve already come close to being a tortured artist and it’s boring.” From the old Stripsearch fan site.