Light L16 Monochrome sensors will indeed help make images with less noise and here's a good example of other companies doing the same thing.
I found this article about the “Essential Phone” camera where one of the engineers goes into detail about why they're putting two cameras on the phone and why one of them is monochrome.
The Essential Phone camera is made up of two cameras that work in tandem with one another. The first rear-camera is designed for color, and like most cameras, it applies a red, green, or blue color filter at different pixel locations, and then assigns that pixel a value. As a result, the camera must interpolate the neighboring pixels to produce the final image. What does this mean? If only some of the pixels are assigned color values, the camera must infer what the rest of the image should look like, and this often leads to less-than-ideal resolution. That’s why we made our second rear camera a true monochrome camera, which does not require any color filter. The lack of a color filter means that no interpretation is necessary—every pixel is assigned a true black or white value, which enables the camera to produce images with much less noise and much higher resolution, no matter the lighting conditions.
There are plenty of example photos as well, I grabbed 3 of them and decided it might help to have them in an animated gif that will show you the improvement.
Read the entire story: Essential | Engineering the Essential Camera