It is the first release in 3 years and has a large number of bug fixes. It also is the first version that includes support for new types of feeds as described by the IndieWebCamp community. These feeds are made up of h-feed and h-entry microformats, which allows the feed to be parsed from the html rather than a separate xml file. SimplePie will now detect when it finds such a feed and parse them when it finds the php-mf2 parser available.
Wow! Look at the movement on this finally! Way to stick with it David Shanske!