Some nice tidbits on DLC info here
Q: The costume pack from the previous Dynasty Warriors as DLC?
A: Yes, and it’s free.
Q: Download-able stages and weapons?
A: Yes, with cost. Price TBC.
Q: Japanese voice option as a DLC for both PS3 and Xbox 360?
A: Yes, and it’s free, your dream has come true!
Q: Are these applied to both Europe and North America?
A: Yes and yes.