The Unions left the table and will likely go on strike.
Bay Area Rapid Transit (BART) has issued a statement that the Unions have decided to strike and left the negotiations table. BART says that there has been progress and they got agreements on 11 issues. A final deal has though not been reached.
So San Francisco and the Silicon Valley will wake up to a BART Strike. BART recommends to check for alternative commute options on BART.gov and on 511.org. The best option is to stay home and telecommute. If your job does not allow for remote work you should check into carpooling. Expect to leave earlier as highways will likely get jammed.
511.org has a Twitter feed informing about the latest developments. Update: BART is now definitive on strike during Bay Area Morning Commute.