A lot of the pavilions have been torn down and most of the Expo site is blocked off now and unlit which make even taking nice pictures impossible. China Pavilion is open through May I think. Not worth the 2 hour line IMO though 40,000 chinese daily will tell you different. This site is handicap accessible from what I remember and there is special front of line access.

They are going to be opening 6 more pavilions this summer including Saudi Arabia and France. A few are being converted to resturants. The rest of the land will develop into housing and shopping.