It is expected that the next device released by the OEM OnePlus will be called the 6T, and will drop about a month from now. The latest image claimed as a leak relating to this event shows a back panel not hugely different from the existing OnePlus 6 model. Like the 6, it displays dual cameras and a simple form factor.
https://www.notebookcheck.net/OnePlus-6T-latest-leak-suggests-the-update-is-more-incremental-than-previously-thought.333334.0.html