While the S21 series is supposed to launch a month earlier than expected, it seems that the design is still being tweaked. OnLeaks is back with a revised version of the Samsung Galaxy S21 Ultra, which has a different camera design from the original renders.
Revised design of the Samsung Galaxy S21 Ultra – note the extra camera/sensor
No, the camera island will still look like that, but there’s an extra module on the back. It’s not clear if this is a fifth camera or some sensor (a 3D ToF sensor, perhaps?). Also note that the position of the LED flash has shifted slightly.