This is a hard decision. I’ve been talking to a lot of WordPress core developers and contributors, and the overwhelming consensus is that Post Formats UI is not ready for WordPress core, and that it would be a mistake to ship it as it currently exists. We’re going to pull it out, and let it continue development as a plugin, much like MP6.

É isso aí. A nova interface para os post formats está fora do core para o lançamento do WP 3.6.