Microsoft announced on the Project Siena Blog that the Japanese and German versions of Siena are now available in the Windows Store.
They have done an unusually “deep” globalization and localization. For example, it’s not just the UI menus that will appear in Japanese and German. Every formula, every function, every property name will now be in the right language. That is what Siena users have asked for.
Vijay Mital added that this is the first of many other languages that Project Siena will support.