This was confirmed on the official Chinese website of the anime series, mangaka Sui Ishida also mentioned ´an important announcement´ on his Twitter account earlier this week. It was also confirmed that the new season will air in January 2015, which is just one season away.
This is a bit unexpected, to be honest, I personally thought that Tokyo Ghoul will just be one of those ´read the source material´ anime, but I guess I should have a bit more faith in Pierrot by now. I´m also very excited, even though I may not have liked the anime as much as other people. Knowing that the manga is ending this month, I wonder if Pierrot will adapt this to the end. What do you think?