Official-looking renders just surfaced online depicting the OnePlus 7 with a waterdrop notch - looking identical to the OnePlus 6T. In fact, the whole front design looks identical to the 6T's except for one small detail - the earpiece.
You can see from the renders that the earpiece grille looks a bit wider than before, which in turn could mean that the OnePlus 7 will come with stereo loudspeakers - a long-awaited feature for OnePlus fans.
The back also carries some minor changes - the LED flash is circular and it's grouped up with the camera module in a single frame. And it looks like most of the changes will be under the hood.
Source (in German)
Never heard of adb?
People with a 6T shouldn't be looking to upgrade anyway