The Chinese BBS/forums are buzzing with the latest submarine launch -- it could be the first of a new class.
Here is Hui Tong's update.
The latest news indicated the first boat of a further improved design (Type 039B?) was just launched at Wuhan Shipyard on September 9, 2010. This improved design has been speculated to feature a new sonar system, a new surveillance system (periscope, radar etc.), and a new weapon system (possibly vertically launched long-range AshM from its extended sail?).