The CicLAvia Blog shared the details of the expanded routes: 

NEW! South Spur: The south spur branches off the route downtown, south on Spring Street, east on 9th Street (which becomes Olympic) and south on  Central Avenue to the African American Firefighter Museum on Central at 14th Street. This new mileage includes Downtown Los Angeles’ Fashion District with hundreds of establishments selling colorful rolls of cloth, and a small area informally known as the “piñata district” where huge numbers of colorful piñatas are sold. The hope is to extend this route further south via Central Avenue in the future.