An interview of "Shingeki no Kyojin
" mangaka Hajime Isayama
was revealed on December 4, 2013. In the interview, he mentions that he is thinking about changing the ending he already had a rough idea about. Influencing his decision is the popularity the series has gained from its anime
and upcoming live-action movie adaptations. He states that he now has a new idea for the ending, but feels conflicted. Though he does not wish to abandon his original idea, he is concerned about the effect the ending will have.
Source: White Screen
Story by -Zeaos