The Bootstrap folks released RC1 of version 3 on July 27, 2013. As I've perused the documentation, it's become clear that v3+ will incorporate some serious departures from earlier versions of the Bootstrap project, to the point that answers to pre-Bootstrap3 questions will not work in Bootstrap 3+.
For example, an inline unordered list previously mandated using the "inline" class:
<ul class="inline">. Now that same styling requires the "list-inline" class:
<ul class="list-inline">. The scaffolding nomenclature has changed from "spanX" to "col-X" (though it's even more complicated than that when you get into it, still, "span" is no more).
How should this be addressed? Is it time to "branch" the twitter-bootstrap tag?
Another issue to consider while we're addressing these tag names: the guys who develop Bootstrap no longer work for Twitter. So the 'twitter-' part of the twitter-bootstrap tag (the part that used to distinguish it from the bootstrap tag) is no longer applicable.