A voice novel for Tales of Vesperia which was announced a while back in VIVA Tales of Magazine has just been released today on the iTunes Apple App Store and on Google Play.
A Tales of Vesperia Gaiden, in the form of a voice novel that can be purchased via Bandai Namco JP's VoiNov app ( ????,boinobe) entitled "Tales of Vesperia: Convictor's Genealogy - One Meeting, Two Swords" has just been released today. The voice novel mainly focuses on the time when Yuri and Flynn were 7 years old and will feature illustrations.
And this goes without saying that this is, indeed, in Japanese.