"The Rmb16,000 million (approx. US$ 2 billion) expansion of Beijing’s airport, currently the busiest in China, is required to handle the massive increase in passengers due to China’s entry to the WTO (World Trade Organisation) and Beijing’s hosting the 2008 Olympics. Its capacity will be increased from 27 to 60 million passengers per annum by 2015".
Found several renderings on NACO website:
That last rendering looks very impressive, especially when compared to the current airport layout:
Photo © TriplET
If you look carefully, you can see the existing terminal as a very small section on the top half of the airport overview rendering.
Interesting times for aviation in China!
PS. Why are there so many BLUE roofs in that airport overview photo??