Source: Craig Calcaterra, NBC Sports Hardball Talk 
The San Francisco Chronicle is reporting that Major League Baseball has told the Oakland Coliseum Authority that unless the Authority renews the A’s lease in Oakland for only two years — which the A’s and MLB want — instead of five — which the Authority wants — that the A’s could move to AT&T Park in San Francisco and play its home games as early as next year.
Fun threat! And the visuals on that would be amazing, of course. Especially on those days when the A’s and Giants both play at home on the same day as they do a handful of times each year.