I recently got 4mb up from 2mb. Torrents / downloads are definitely faster, but general internet usage doesn't seem to have changed - I am pretty sure whatever nefarious stranglehold the GFW has over our connection to the non-China net is pretty much unaffected by your local connection speed.
My internet connection is on a university system through China Unicom.
AVG has a free speed test option and it shows:
1. to a site on the mainland (Xiamen)
DOWNLOAD - 13.53 mb/s
UPLOAD - 13.01 8mb/s
2. to a site off-shore (Tokyo)
DOWNLOAD - 1.35 mb/s
UPLOAD - 14.32 mb/s
I think the results are trying to tell me something about the internet system in China!