All additional language curriculums come as separate language content packs, which can be purchased individually, like the Chinese curriculum right now.
https://user.brillkids.com/onlinestore/ls-little-reader-content-chinese.phpSo V3 would not come automatically with Russian, French, Spanish or Arabic curriculums. But those language curriculums would follow shortly after the release of version 3. All of them are in the works right now, at different stages of development and completion.
Hope this helps.