Now it's available to all users in English.
Since not everybody that uses Blogger speaks English (nor is English even the most common language of the world population), this doesn't quite indicate a global release of the product. And those of you who do speak English may want to check your language settings, and make sure that your Blog and Profile languages are set to English. Hopefully, you'd already know that, but maybe not everybody has this as a priority.
So what happens if your Blog or Profile Language is set to something other than "English"? If you try to add the Following gadget to one of your blogs, you might observe the advice (in French, for instance)
Ce gadget est experimental. Il n'est pas encore disponible sur tous les blogs.the keyword here being experimental.
See Roberto's Report: Following - Which Languages? for details about this discovery, particularly if English is not your primary language.