OnePlus may be working on a OnePlus 8T and 8T Pro mid-year refresh. The first clues for this come from a code snippet pertaining to the latest version of the OnePlus Camera app, which includes references to a 64 MP shooting mode. The code indicates that the 64 MP mode can capture highly detailed shots in well-lit scenes.
https://www.notebookcheck.net/OnePlus-8T-and-OnePlus-8T-Pro-could-be-in-the-works-camera-app-teardown-points-to-a-64-MP-shooter-that-takes-highly-detailed-shots.482941.0.html