to be honest I think there will be one, mostly because if you've seen the OVA Book of Murders then you'll understand at the ends of it how the creators will easily be able to make a season 4 out of the ending of that OVA (imma not gonna say what happens just incase anyone who reads this hasn't seen it before/yet)
According to the interweb (Lelz what a great word XD) because the time between the original airdates of Season 2 (Black Butler ||) and Season 3 (Black Butler: Book Of Circus)... well it took them 3-4 years before they aired Season 3 (Season 2 Aired: 2010 -11) (Season 3 Aired: 2014) but then again it took them 1-2 years to air season 2 after the first season came out (Season 1 Aired: 2008 - 9) So it's a 50/50 chance that they will make a season 4... (but if they do Ciel won't be the same as before since he would be older :/ ) Lelz I did my Homework ^^ aka Researching or in my language Stalking XD
I think that there's going to be a season 4 but it will most likely be from the manga like Book of Murder, Book of circus and some episodes from the first season.
I hope they make a new season from the events from the manga because the manga its way better than the anime
It will be interesting to see if they do continue the anime. I am looking forward to the Book of Atlantic movie coming out later this year. They definitely have enough material for a 4th and 5th season if not more. It'll be interesting to see what they could do with the Public School, Emerald Witch and Blue Cult arcs.
I know how they could start a season 4 story, but they'd need to make a story where pieces of Ciel's soul are hidden. Example... various blood samples of Ciel's could be the receptacles of his soul, almost like the Horcruxes in Harry Potter, except Ciel's soul will not be in individual items, but simply in the blood he's left behind. Now the small bits of soul that can be found and collected will not be enough to give Ciel back his original life. However they might be able to jump start a completely different one. Perhaps it will be better, perhaps worse.
Also his butler, Sebastian will be able to recollect the taste of his soul just from the blood samples alone much like Claude did when he tasted Ciel's blood. This might help to keep him attached to the demon Ciel through a sense of loyalty, rather than through a contract. This will help to foil the one made by Hannah and Alois. Also the story could have Sebastian teaching Ciel how to be a proper demon.
Um Confused !! Didn’t Ciel turn into a demon at the end of season 2 ??!?
First rule of Kuroshitsuji: The second half of the first and the second season do not matter. They are not canon. They were overridden when they decided to stick to the manga for season 3. Ciel is not a demon.