The OEM OnePlus had previously announced that it would release a 5G phone this year. Today (February 11, 2019), they have apparently released a confirmation that this device would feature at the Mobile World Congress (MWC) this year. It will showcase the device at Qualcomm's booth during the event.
https://www.notebookcheck.net/The-5G-OnePlus-phone-s-unveiling-at-MWC-2019-is-reportedly-confirmed.406486.0.html