TfL has announced the next routes to run the New Bus for London: the 9 and 390.
Route 24 was the first to go all-NB4L in June with the 11 due to follow on 21 September, plus you can still see a few prototypes plying the 38 (with rear doors shut). But by the end of the year the routes from Aldwych to Hammersmith* (9), and Archway to Notting Hill (390) will also only use the Thomas Heatherwick designed vehicles.
What all these routes have in common is that they traverse high visibility tourist spots – Trafalgar Square, Westminster, Kensington museums, Oxford Street, Piccadilly, St Paul's etc – so if you're a regular on the, say, 253 we wouldn't recommend holding your breath for a shiny new bus any time soon. (Though with the recent overheating problems, perhaps you'd be happier that way?)
Photo by kenjonbro from the Londonist Flickr pool
* Rather than to Somerset House as we said earlier, which would be the shortest bus route in London.