[kumar303]

No commercial Firefox OS devices are shipping in any English speaking country. It looks like you're finding community blog posts probably clustered around launch countries. Anyway, press releases are always announced in English here: https://blog.mozilla.org/blog/category/press-releases/

[listic]

Sure. But isn't it up to Mozilla, rather than its partners, to announce the release of their Firefox OS?

I can see no release announcements in this blog, either.