The SHA-3 specification was released yesterday; git-annex got support for using SHA-3 hashes today. I had to add support for building with the new cryptonite library, as cryptohash doesn't (correctly) implement SHA-3 yet. Of course, nobody is likely to find a use for this for years, since SHA-2 is still prefectly fine, but it's nice to get support for new hashes in early. :)