Interesting improvements. Custom domain name hosting like what's offered by Wordpress and Tumblr.
Medium released a publishing API.
Medium - Tech Talk - Jul 29, 2013
Medium - Products I Wish Existed - Jul 29, 2013
Medium - Life Hacks - Jul 29, 2013
Web-based publishing platforms that I've created - Mar 03, 2015
Medium.com posts to read 16May2013 - May 16, 2013