Comic Con 2017 - Spoiler Thread (season 13)
Entertainment Weekly
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Supernatural cast talks season 13: Castiel is 'more dead than usual'
J2: Sam and Dean will find themselves butting heads when it comes to how to handle Lucifer’s baby. (Not surprisingly, Sam takes the slightly more compassionate approach to dealing with things.)
Misha: Castiel “comes back slowly”. “He’s very dead … more dead than usual.” But fear not, he will be back. At least, “the most important parts” of him will be.
Src: http://ew.com/tv/2017/07/22/supernatural-season-13-jensen-ackles-misha-collins-jared-padalecki/