In addition to adding the Constitution Annotated (and app) to Congress.gov and prepping for redirecting THOMAS.gov and THOMAS.loc.gov to the new system, we are launching a new set of enhancements today.
Several of the changes in this release come from our user feedback. Many people asked to have the current Congress set as the default for searching. Starting today, the default search will be run across legislation in the current Congress. You can use the facets to broaden your search to include all Congresses or to include other data (e.g., Congressional Record or Committee Reports.) You can also use the facets to select more than one specific Congress (not just one or all as before).
Just as with previous releases, Jeanine has provided a list of what is new for this release on the About Congress.gov page:
September 2013 Release
The focus of this release is on improvements to the web interface as well as infrastructure and operations.