OnePlus has now officially announced a launch event scheduled for April 28 in India. The company only claims an "array of OnePlus devices" will debut at the event, but all available information points towards those being the Nord Buds, OnePlus 10R, and Nord CE 2 Lite.
https://www.notebookcheck.net/OnePlus-Nord-Buds-OnePlus-10R-OnePlus-Nord-CE-2-Lite-to-launch-on-April-28.613220.0.html