If you guys watch the English PSO2 credits, there's also a romanized list of Voice Actors. Unfortunately they don't specify what parts they played, but you get a general list.
There's some AAA-grade voice actors/actresses in there.
And man, I KNEW I recognized Lisa's voice actress. Kana Hanazawa has a very distinct voice. I think she did Chelsea in PSP2:I didn't she?
Edit: Checked the wiki. There's a lot of missing info - and they added voices to some NPCs that didn't have them (Coffee for instance). Hoping that info is revealed somehow.