The Metro Red Line will be seeing an extension. Due to resident outcry, and mass support, including YIMBYism, the line will be extended down Wilshire Boulevard, out to Santa Monica. The line was originally to continue out to the "sea", but was thwarted by an explosion during construction of the existing portion at a Dress for Less store.
Newly elected Mayor Antonio Villagrosa has made the subway one of his top priorties, and may be one of the reasons he won the election. There are also brewing rumors that the line will be extended into the San Fernando Valley, following the path of the current Orange Line busway out in the valley. Even with the most optimistic scenarios, the extension would open in 2012 at the earliest.