Oracle has officially released Java 7 to public. It's been few years since a major upgrade to Java and this is Oracle's first major release of Java since the acquisition of Sun in 2009.
Just like the usual process, a major release will bring a lot of new features such as a new Filesystem API, support for asynchronous I/O, a new fork/join framework for multicore performance, improved support for dynamic and script languages, updates to security, internationalization and web standards and much more. All of these are well-documented on Java's Release Notes.
You can start downloading Java 7 on Oracle's website