Reading Order:
DCeased #1-6 (Original Series that sets off this little line of books)
DCeased: A Good Day to Die #1 (A one-shot that is set in parallel to the main series, showing what happened to some of the characters during this event not seen in DCeased.)
DCeased: Unkillables #1-3 (Another parallel story to the original series, showing what happened to some characters not seen in DCeased did during this event.)
DCeased: Hope at World's End #1-14 (Currently being released, appears to be an anthology series showing what happened to various characters between the opening of DCeased and it's sequel series.)
DCeased: Dead Planet (An upcoming sequel series to the DCeased.)