User blog comment:Kajune/Season 12, Lucifer will have a new vessel/@comment-29551856-20160807190639

The revenge part was about Crowley, not Lucifer. At SDCC 2016, the staff of SPN has affirmed that Lucifer wants "a vacation" after ruling both Heaven and Hell, and that "he's tired". No malevolent nature for Lucifer from now on.

Even so, Castiel will still want to find him. Crowley will join him, wanting revenge after that "cleaning the floor with toungue" thing.