Yes, they have an entire section on languages with Rosetta Stone courses. Japanese among them.
Yes they have an extensive amount of books on different languages from learning how to speak write and more.
Yes they should.
I bought my daughter a book for $14.99(not the Rosetta Stone product) about 6 months ago and it's not only helped her learn the language but also customs and Japanese etiquette as well.
Yes, they do. I've even seen foreign language workbooks.
Thanks! Your answer is awaiting moderation.