Google announced they have renamed the rich snippets testing tool to the structure data testing tool and have have improved the rendering of the rich snippets, cleaned up the user interface, and added in many new languages.

The tool is still located at google.com/webmasters/tools/richsnippets but was renamed to better fit what it does (all structured data, not just rich snippets).

Google also updated the tool adding:

An improved display in rich snippets in the testing tool to better match how they appear in search results.
The brand new visual design makes it clearer what structured data we can extract from the page, and how that may be shown in our search results.
The tool is now available in languages other than English to help webmasters from around the world build structured-data-enabled websites.

Here is a picture:

Forum discussion at Google+.