While I still don't have the game, I have found the credits for Soulcalibur V on Youtube .
This is the list of English voice actors:
Help is needed here. Laura Bailey is not credited as Pyrrha's VA and Jennifer Hale isn't voicing Tira anymore but I have no idea who might have replaced her. I can see that the VA we have listed as Raphael, Cervantes, ZWEI and I have no idea how many more are not credited here so most likely incorrect. Actually, I can be sure of only Lani Minella voicing Ivy and Johnny Yong Bosch voicing Xiba at this point. Paul St. Peter is the announcer.