Tales of Zestiria's Japanese release date has apparently been leaked over at Tales Channel +.
The post has long been taken down, but screenshots of the leak show that the game will be released on January 22, 2015. We'll have the September 13 issue of Jump confirm that, but if this was leaked at Tales Channel + itself, then this is almost 100% correct.
With the Japanese release date on January, perhaps the Western release won't be so far off. Maybe Spring or Summer 2015? What do you think?