Although the PC version hasn't supported Spanish, I'm pretty sure they'll do it sooner or later since they have recruited people for Spanish localization. And when the PC version supports Spanish, it's easy to port it to the console version.
To be honest, I'm quite surprised that they plan to launch NW in Japan. Nowadays, mobile/handheld games are most popular in Japan, while MMO is the least popular game genre there, not to mention that NW is based on DND which Japanese have no interest. Even WOW doesn't have a Japan version, so I really think it's a risky…