This is a major release that has a number of improvements related to MusicBrainz and iTunes. The main items are a detail panel that allows you to edit details of the current track quickly and easily. Support for extended iTunes fields such as Sort Composer and Is Compilation, more fields are now populated from MusicBrainz and there is better support for Compilation Albums.
More details at http://www.jthink.net/jaikoz/jsp/news/build1030.jsp