In the end Mrs. Johnson's update was called "Erik and Mrs. Johnson" aswell so it could just be to have a little connection to what will be included. In the latest post DC actually called it
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. So after all we'll certainly get some Dexter content - what ever that may be. I think I remember DC hinting that Dexter could even have an affair with one of Roxxy's friends or something? Not sure if I remember that correctly though.
All in all I'd guess we'll get a few seperate endings like in Eirk's and Mia's story again.