OnePlus' next flagship will be called the OnePlus 7 and the leaks have started coming in already. The company is expected to showcase the OnePlus 7 smartphone in Q2 of 2019.
The first OnePlus 7 leak comes courtesy of CoolAPK (removed), later reposted by SlashLeaks, a discussion platform where anonymous users share images/details of upcoming devices. The image leaked shows an unknown OnePlus smartphone (on the left) besides the latest OnePlus 6T smartphone (on the right), both in a protective case.
The device on the left happens to have a full-screen bezel-less display with no waterdrop notch as seen on the 6T. The bezels on the edges are also minimal and the right side hosts the alert slider with the power button just below it. It can be clearly noticed that the alert slider has a red paint job, not seen on any OnePlus device.