Sorry I can't type Japanese at hotel's PC. f(^_^;)
I arrived at Shanghai today from Tokyo and I met K-san(pit reporter) before the custom in the airport.
-Shuttle bus info-
I called the circuit about the shuttle bus from downtown to the circuit. They told me one of the shuttle buses is starting from Hongkou(kanji ha niji kuchi) football stadium during 7:30 - 12:00 and is FREE! with F1 ticket. for more info of other 3 terminals, call officials at 021-69569999. I hope this helps.
(someone, please translate this info into Japanese.)