There is no denying the fact that Tokyo Ghoul is an anime with a very engaging plot. There is also no denying the fact that the second season of the anime was a major disappointment to fans, with several key characters removed completely from the story and several plot points brazenly changed.
Thus, avid fans of the franchise took it upon themselves to petition a change in the studio which would tackle the anime's third season, which is rumored to be released either late this year or early 2017. This was because most of the points that were changed from the manga's original progression were allegedly undertaken by Studio Pierrot, which greenlighted the changes which ultimately made Tokyo Ghoul Root A into the failure that it is.
The petition of the fans suggested that an animation studio with a reputation for sticking close to the source material, such as Madhouse, would handle the franchise better. However, as much as the petition was a novel idea, it ended, just like the anime's second season, as a massive failure. By the time the petition ended, barely half of the required signatures were achieved.
Thus, with the petition out the door, production on the third season would most probably go full throttle. Then again, with the manga's progression being said to be inadequate to warrant a complete run for the third season, the notion that Studio Pierrot would simply add fillers to the anime becomes very real.
Fillers in the third season of Tokyo Ghoul have already surfaced in numerous rumors in the past, with some speculations suggesting that the anime's creators are looking at simply shifting the third season's story to the point of view of another character.
With the overall progression of the manga, however, there is actually a third option that the producers of the anime could pursue; one which is embraced by fans. The producers could simply reboot the series, making it far edgier and raw than its first iteration. After all, the Tokyo Ghoul manga is known for its no-holds-barred approach to the brutal realities featured in the plot. If Studio Pierrot could do this, Tokyo Ghoul might very well become the next Fullmetal Alchemist: Brotherhood, a runaway success of a remake because of its faithfulness to the manga.
The release date of Tokyo Ghoul Season 3 is yet to be revealed, though most rumors are suggesting an early 2017 release.