User blog comment:XGlass Reflection/Ep. 25 Review~ I'M ALL FIRED UP/@comment-3118594-20130930163152/@comment-7418318-20130930230635

Isayama said he planed to finish the manga in the next 3 years and now people started to think this automatically means that they'll continue the anime after that, but as far as I'm aware there isn't even an official confirmation of whether there will ever be a continuation, much less an approximate release date.