This photo showing satellite engineers (for both FY-4A and the mysterious sat flying late this month) visiting nearby villages in one of China's poorest regions leaves no doubt as to the identity of the latter satellite.
A State of XSLC Pads Update:
LC1: LC1 continues to have construction between launches for an unknown reason.
LC2: A CZ-3B family rocket is currently being stacked at LC2 for TJS-2.
LC3: FY-4A's CZ-3B/G2 is fully stacked on LC3.