This was revealed in a set of hands-on pictures of the Galaxy Note 10, leaked by TechTalkTV on Twitter. As is the case with all early hands-on image and video leaks, the quality of the pictures is absolutely horrible, but there are telltale details that lend them credibility.
Just as we expected, the Note 10 seems to have a centered selfie camera, and it appears to be somewhat smaller than the one on the Galaxy S10. Taking a closer look at the two pictures where the front-facing camera is visible, there seems to be a factory protector pre-applied on the screen. The edge of the camera cut-out in the protector is also visible in both shots, as it catches a reflection from the overhead light. Moving around the back—in true early-hands-on-leak fashion—the only photo we have of the camera on the Note 10+ is an absolute mess of motion blur and compression artifacts. Still, the rumored quad-camera is visible and (fairly) recognizable from what we've seen from renders.
We haven't yet been able to confirm the legitimacy of the leaked images, but from what we've seen, this may very well be our first real look at the Galaxy Note 10+. A blurry and low-resolution look, but our first nonetheless.