On his official blog, the actor writes, "Tales of Vesperia is coming out on one thing after another: Xbox 360, then PS3, and now upcoming, goes on sale even on the Wii. More shortly, the feature film anime version is also opening in theaters (But, I, I'm not in it...), and after that, there's also a CD."
It's possible the voice actor confused Tales of Vesperia with Tales of Graces — there are a lot of Tales to keep straight!
Koyama voices the character of Duke in Tales of Vesperia, which was originally released as a timed Xbox 360 exclusive in 2008. The PS3 version was released in September 2009.