The BBC reports that London Overground will run 24-hour weekend services from 2017 as part of a a wider programme to boost London's night-time economy. The article says:
"Weekend trains are due to start running 24-hours on the Piccadilly, Victoria, Central, Jubilee and Northern lines by the end of the year. Night-time services will be extended to the Metropolitan, Circle, District, and Hammersmith & City lines by 2021. Services will be extended on the London Overground in 2017 and the Docklands Light Railway by 2021.
"The government said it will provide £10bn of funding for investment in new London transport infrastructure over the next parliament, including new Tube improvements, better roads, more buses and cycle lanes, amid predictions the population of the capital is expected to reach 10 million by the early 2030s. The so called "night Tube" was announced in November 2013, with all-night services expected to run on Fridays and Saturdays on the Piccadilly, Victoria, Central, Jubilee and Northern lines from September."
An all-night weekend service connecting us to some of London's best nightlife is a great leap forward, and to get it up to four years ahead of many parts of the capital is a rare treat.
UPDATE - Knew it was too good to be true - the service will run from Highbury to New Cross Gate, still helpful for those of us near the north end of town, but not so much for the southerners.
Confirmed that 24hr running on @LDNOverground restricted to ELL core section @BorisWatch @railnews
— GoblinUsers (@RidingtheGoblin) February 20, 2015