TfL are very good at the old online alert business. Works on the Jubilee Line feature more than most in the jolly little e-Mail alerts sent out, in the style of the one shown below. The multicoloured drill, representing work on all the lines, also features heavily on London Underground's "Transforming the Underground" hoarding posters.
Some more publicity about the 7-car trains. By now, you know the drill (I'll get me coat).