There is nothing official from Japan yet but according to a listing on a Chinese anime distributors website, Tokyo Ghoul season 2 is scheduled for January 2015.

Tokyo Ghoul Season 2 Scheduled for January 2015 According to Chinese Distributors Tokyo Ghoul 2東京喰種-トーキョーグール-Winter 2015 anime

Key Visual:

Tokyo Ghoul Horror Anime Taneki

Tokyo Ghoul is a manga series by Sui Ishida. It was serialized in Shueisha’s seinen manga magazine Weekly Young Jump between September 2011 and September 2014 and has been collected in thirteen tankōbon volumes as of August 2014. A prequel titled Tokyo Ghoul: JACK is running online on Jump Live and a 12-episode anime television series adaptation by studio Pierrot aired on Tokyo MX between July and September 2014. A second season has been announced.

Tokyo Ghoul synopsis from Haruhichan:

The suspense horror/dark fantasy story is set in Tokyo, which is haunted by mysterious “ghouls” who are devouring humans. People are gripped by the fear of these ghouls whose identities are masked in mystery. An ordinary college student named Kaneki encounters Rize, a girl who is an avid reader like him, at the café he frequents. Little does he realize that his fate will change overnight.

Source: Crunchyroll, yaraon