It's both, it's definitively temporary.
What I mean is we as a team are not going to publish something to svn and then rip it out a few months later. On the other hand Anope is constantly changing in the quest to be even better, so yes .. it's both.
On a personal note, please do NOT ask this question everytime you see something change, because it will get annoying really fast. If you don't want change, use the Stable 1.6 branch.