A few weeks back, Showtime president David Nevins was asked about the possibility of a Dexter spinoff series and replied, "Nothing is off the table.". IGN picked some options for a potential spinoff: 'M.I.A.M.I. M.E.T.R.O.', Masuka, 'Waif and the Hat Man' and more.
Read a great article, by Matt Fowler, here.