According to this site he will be voicing someone named "Siru". I assumed it was just Sora but according to a google search, Siru is the BHK. Since the BHK's name is also (and more widely) reported to be "Roxas" then I have no idea.

Either "Siru" is just a mis-spelling of "Sora" or the English name for Roxas.

*Shrug* I hope someone can shed some light on this for me.