OnePlus held its global launch for the 8 and 8 Pro smartphones yesterday (April 14, 2020). However, it also had a China-only launch event for the same scheduled for later. The OEM's official Weibo channel has teased the possibility of a "mysterious new product" for this show; could it be the 8 Lite/Z?
https://www.notebookcheck.net/OnePlus-Chinese-launch-will-include-a-mystery-product-alongside-the-8-series.461723.0.html