Things are moving quickly in Bootstrap-land. I'm not quite sure I would have called these "Release Candidates" though, given the number of functional changes to the framework that have been happening/are lined up to happen. Still, that's likely due to my interpretation of an RC (feature-freeze).
On a different note: I am a big fan of Bootstrap. Yes, there are tons of complaints from users about sites "looking like Bootstrap", but that's hardly a fault of the framework (at least they look passable). I've always found that some button customisation (easier in 3.0), changing the navbar (color, height, dropdowns) and tweaking the forms is the easiest path to getting a site that doesn't look like vanilla framework. And none of those things require much work or expertise: heck, just a change in height, a different nav-bar font + color go a long way as it is.
On a different note: I am a big fan of Bootstrap. Yes, there are tons of complaints from users about sites "looking like Bootstrap", but that's hardly a fault of the framework (at least they look passable). I've always found that some button customisation (easier in 3.0), changing the navbar (color, height, dropdowns) and tweaking the forms is the easiest path to getting a site that doesn't look like vanilla framework. And none of those things require much work or expertise: heck, just a change in height, a different nav-bar font + color go a long way as it is.