Earlier reports suggested that "Attack on Titan" season 2 would start airing in the second quarter of 2016, but something must have come up to push the release date until much later this year. However, more reports seem to imply that season 2 will not be released until January 2017.
Fans were left wondering why the release date has been pushed farther and farther out, but according to Game n Guide, the January 2017 air date was confirmed by Kodansha, "Attack on Titan's" owner, through Selecta Vision, the official licensor of the anime series in Spain.
Two reasons are being eyed for the delay in air date. First is director Tetsuro Akari's unavailability since he is currently working on another anime series, "Kabaneri of the Iron Fortress." Another reason being pointed to is the lack of story arcs to sustain the development of the anime, as "Attack on Titan" is heavily based on its manga version.
Apparently, four story arcs are required in order to start with season 2. However, only two arcs have been completed to this day. Waiting for the other two arcs, which are currently in the works, would definitely mess with the production of the anime series and affect the targeted air date, as reported by the International Business Times.
If the producers fail to bridge the gap between the anime and manga versions of "Attack on Titan," they might just have to settle for a new plot and storyline altogether. Should that push through, Mobile and Apps said "Attack on Titan" season 2 would be more of a reboot than a continuation of season 1.
On the other hand, if the producers stick to the manga storyline, fans could expect that the latest story arcs for "Clash of Titans" and "Uprising" would be included.
Nevertheless, it appears that while no confirmation has been given about this rumor, fans are already anticipating it.