What Happens Now to Tumblr?

It has been like 3 months since Matt Mullenweg announced that Automattic acquired Tumblr. Until now, though, I have not seen any developments in my Tumblr Dashboard, nor any announcement for plans by Automattic on what to actually do with Tumblr. So what now? What current Tumblr functionalities will be dropped, and which WordPress features will be added?