https://twitter.com/AdamSchefter/status/819376593734946816@AdamSchefter: A stunner: Chargers plan to announce as early as Thursday they are moving to LA, ending 55-year stint with SD, league sources tell ESPN.
The NFL had preferred for the Chargers to stay in San Diego but they couldn't reach a deal for a new stadium (I believe the owners wanted some tax money to help build it). My guess they are going to share a stadium with the Rams.
Edit: Schefter's story is up
http://www.espn.com/nfl/story/_/id/18455802/chargers-expected-announce-move-san-diego-los-angeles
This is said to have been an extremely difficult decision for Spanos to reach, sources said. While the economics of the decision have been crystal clear, Spanos' loyalty and connection to San Diego have countered it. But in the end, Spanos' efforts to find a new stadium are now in their 16th year, with no solution in sight. This stalemate is occurring at a time when the Rams are becoming more established in the Los Angeles market. Spanos is said to believes he needs to start fighting for the Los Angeles market as soon as possible.
As of Wednesday night, the Chargers' intent is now to become the second team in less than a year to move to Los Angeles, ending the 55-year stint with San Diego and giving Los Angeles two NFL teams after going more two decades without having one.
Schefter also goes on to say that the source says that they may change their mind again but this is what they are leaning towards.