The Docklands Light Railway will receive new, three car units in time for the Olympics in 2012. The first of these units was unveiled in London by the mayor. There should be a 50% increase in capacity by 2010, with an expansion to the system currently being undertaken.
I guess this is one of those benefits in having the Olympics, you should get a better transport system. At least they have given themselves a two year period to get the capacity and network upgrades working.