The Snapdragon 855 was unveiled a few days ago, and one of the biggest talking points was its 5G modem. Most companies will release 5G phones in 2019 and OnePlus is billed to be among the first, although the device could very well come with an MSRP in the region of US$800.
https://www.notebookcheck.net/There-s-a-5G-OnePlus-phone-coming-and-it-could-cost-US-300-more-than-normal.375291.0.html