18 April 2019
CNSA announced the cooperation plan for its future Chang'e 6 mission, offering to carry a total of 20 kg of solicited payloads. The orbiter and lander of the Chang'e-6 mission will each reserve 10 kg for payloads, which will be selected from both domestic colleges, universities, private enterprises and foreign scientific research institutions. As the backup of the Chang'e 5 mission, the Chang'e 6 mission will also collect lunar samples automatically for comprehensive analysis and research. Chang'e 6 launch time and landing site will depend on the performance of the Chang'e 5.
update - with a comment by Dr. Sönke Burmeister from Institute of Experimental and Applied Physics of the Kiel University in Germany