i would hope that the new terminal will handle all flights because it is quite a distance from the existing terminals and will have its own access road, but who knows.

here is a picture i just googled:

http://www.gluckman.com/Beijing-Airport.jpg

the roof is translucent and will reportedly change color based on the inside temperature. the structure is more or less complete; you can see it when you're there (best views are from the air and runway)