The rumor mill is already working through reports on OnePlus' next-gen flagship smartphones. One of them is thought to be called the 9, and is linked to renders showing triple rear cameras, two of which are much larger than the third. A new leak asserts that they are both to be 48MP in resolution, although they both have different functions.
https://www.notebookcheck.net/The-OnePlus-9-is-now-touted-to-have-dual-48MP-rear-cameras.505504.0.html