Adding a note...
Something is now out there because its no longer seen. Previous satellite pictures of Jiangnan shipyard, where people's main focus is to point out how many 055s and 052Ds are under construction or fitting, used to also have a Yuan class docked and in fitting. JN appears to have taken the tasks of building Yuans in addition to Wuhu, the first time the CSSC concern has taken on building submarines which used to be the traditional domain of CSIC.
Later pictures of JN, though mostly focused on the state of construction of the 055s, no longer seem to show the new Yuan there. I suspect this sub to be operational and has joined the fleet.