The first thing that comes to mind is that this could be one of the new sensors we will see on the back of the Galaxy S11 or Galaxy S11+. The latter was shown in leaked renders with five rear cameras, and it's possible one of these could be dedicated to improving results in low-light conditions. Precisely how this ‘Bright Night Sensor' would work is anyone's guess – perhaps this sensor is just the laser autofocus module that is rumored to be present on the Galaxy S11 series and not a proper camera?
It's hard to say, as there's not enough information available about the Galaxy S11 cameras at this time. Rumors suggest the flagship will be equipped with a 108MP main camera and a telephoto lens capable of 5x zoom, and we can assume another camera will be dedicated to taking ultra-wide pictures. The rest is a mystery, unless we don't count the Galaxy S11e, which is expected to have a traditional triple camera setup like the Galaxy Note 10 and Galaxy S10.
