Going through the Science sites, I realised there is no Anthropology.SE (yet!).
These are some related ones, though. I think it's impossible NOT to have some overlapping, so the discussion is both about scope and potential audiences. For example: Cognitive Sciences, Linguistics and Biology.
Then, there are smaller sites / sites in progress like Forensic Sciences, Open Science, Science Educators, etc, which are related as well, but I believe have very specific communities.
All in all, I believe anthropology has enough specificity to allow for its own site. In regards to methods, for example, but also scope. It's not sociology, it's not history. It's different.
Something I still haven't really elaborated much is the role archaeology could have in this new site. I imagine, considering that the potential pool of users for anthropology is not the most impressive thing in the world (I would argue lots of people are interested in it, though, and most are not necessarily related to academia), that we could benefit enormously from archaeology questions. And if they generate enough motion, those users could move on to creating another site for the field.
What do you think?