According to Harington himself, he is not done with the popular drama. This came out while he was promoting his new movie called, Testament of Youth. Shortly after the interview, a user on Reddit made the translation and posted what the actor said about Game of Thrones online for all to see.
Saying that the demand of Game of Thrones has been so high that he has had to pass on other projects, Harington said that the show has drained him and even though he owes a lot to the show, he now knows how long his contract is for. Those words were enough to send the internet into a frenzy of excitement knowing that John Snow was coming back.
Even though fans are expecting him to be back for season six, there is still hope that he has a lot more to give to the show depending on how long his contract actually is. Harington is only 28 years old and that just means there are a lot of good acting years left in him.