OnePlus' first 5G phone will be released in partnership with the carriers EE and Elisa in the second quarter of the year. They are located in the UK and Finland respectively, and are the only companies to be associated with the release of this phone so far. OnePlus' CEO has indicated that the device will cost under US$1000.
https://www.notebookcheck.net/The-5G-OnePlus-phone-will-be-released-in-the-UK-but-not-the-US.410667.0.html