In addition to CARS land opening on June 15th, 2012 – they are adding much more to California Adentures:

The Red Car Trolley system:

When Buena Vista Street opens at Disney California Adventure park, guests will be transported back in time to Los Angeles of the 1920s and ‘30s. This trip to the past would not be complete without one of the most beloved symbols of Los Angeles history, the Pacific Electric Red Cars. The Red Car Trolley, making its debut along with the rest of Buena Vista Street, will be inspired by this landmark transportation system.

At its peak in the mid-1920s, the Pacific Electric Railway was the largest electric railway in the world, connecting Los Angeles and the surrounding Orange, San Bernardino, Ventura and Riverside counties. Established in 1901, the Pacific Electric Railway carried passengers throughout the Southern California area for the next 60 years.

The Carthay Circle Theatre (re-creation of 1937 theater).

Buena Vista Street:

This new entrance to the park will transport guests to a romantic, idealized version of 1920s Hollywood when Walt and Roy Disney first arrived in California to begin their careers as filmmakers. Buena Vista Street will be the perfect place for guests to shop and eat, watch the parade, or just sit and soak up the atmosphere.

CARS Land Test (plus previews/renderings of all the other new additions):