Sui Ishida after finishing his Tokyo Ghoul manga has started working on new manga project which is going to release on October 16. The name is still a mystery, but the first chapter will have 45 pages with a color opening page.
This year's 45th issue of Shueisha's Young Jump magazine teases by saying

"The legend has a beginning. If you bear witness to this beginning, it will be a moment you will never forget as long as you live!! "

Tokyo Ghoul anime first season has just finished, the second season might come next year.