Attack on Titan is a Japanese franchise which has literally smashed the international market. Based off of the highly popular manga series, the anime that aired in 2013 drew in plenty more fans to the franchise.
Part of the success was down to the fact the creators followed the manga extremely closely. This meant no episode acted as a "filler" episode, allowing each episode to build to a fast-paced story which built suspense and excitement for the viewers.
Fans rejoiced last year as Season 2 was announced, however this has now hit a wall. Scheduled for release this year, the series was set to create original content as the manga was still being written. Well not any more.
Attack on Titan Season 2 has been suspended for this exact reason. The creator of the franchise, Hajime Isayama, and the director of the anime, Tetsuro Araki, have both stated the manga should always be four story arcs ahead of the anime series. This means original content will not be required and keep the alignment between the manga and the anime that fans have come to expect. The manga is currently only two story arcs ahead of the anime, which means Tetsuro Aaraki cannot complete the second series of the anime without creating original content.
While many fans will cry out in rage that they are having to wait to see the second series, it should not be ignored that it is only being held off for very specific reasons. It is not a case of the creators not wanting to release the series yet, but instead keep true to what fans have come expect from the anime. I personally support the creators, as they know the current format of converting the manga into the anime has worked with great success. If they were to create new content, it could alter massively the direction of the story in years to come when compared to the manga.
Fans of the franchise can still look forward to the computer game set to be released later this year. The game has already been released in Japan and is set for release in Europe and North America later this year for Playstation 3, PS4 and PS Vita.
The game has been created by Koei Tecmo Games who are the creators of the highly popular Dynasty Warriors game series among other titles. Capcom have also announced an arcade style game in the works by them. So while Season 2 may be delayed until a yet specified date, fans still have plenty to sink their teeth into.