This document summarizes the new features of Oracle SQL Developer version 4.0. It discusses improvements to the user interface, performance enhancements, expanded database support, improved data modeling tools, enhanced reporting functionality, and many bug fixes. Version 4.0 offers a redesigned find object tool, database cart for object comparisons, faster report design, cloneable object editors, and usability improvements. It also requires Java 7 and supports the latest Subversion version.