From Revolver Magazine:
It has been widely reported that ‘Meliora’ marks the debut of a new singer, Papa Emeritus III, who is the successor of Papa Emeritus I and II— the vocalists on ‘Opus Eponymous’ and ‘Infestissumam,’ respectively. The band members are staunch in their assertion that they welcome a new singer with each album to mimic the Catholic Church’s succession of popes—even while conveniently ignoring the fact that it is clear to listeners that each Papa has sounded, well, exactly the same. And yet, Nameless Ghoul is only too happy to expound upon just how much Papa III differs from his ‘Infestissumam’ predecessor.
You can read the full interview at Revolver Magazine