Full release notes: http://galaxy.readthedocs.org/en/master/releases/15.07_announce.html

Highlights 

 * Interactive Environments - The interactive environments (IE) framework features several updates this release and Galaxy is now distributed with a new IE for RStudio implemented by Eric Rasche. 

 * Workflow Editor Enhancements  - The workflow editor has been significantly revamped - it now uses newer tool form components and allow construction of workflows with tools explicitly producing output collections. 

 * Policies for Committers and Pull Requests  - The process for adding committers to the project and fielding pull requests has been formalized and documented in the source code. Three new committers have been added to the project - Björn Grüning, Nicola Soranzo, and Eric Rasche.