Rumors began percolating a few weeks ago that Samsung would be revamping the notification LED on future phones by making the entire border area around the camera sensor light up. The existence of "Smart Glow" was confirmed by a manual for the Galaxy J2, but the diagram in that left a lot to be desired. Now, SamMobile has a leaked image of the Galaxy J2 itself with Smart Glow. It looks... kind of not great.
The Smart Glow ring around the camera will apparently light up when you have notifications, just like the front-facing LED does now. It should have a few more configuration options in software, and could also be used as a photo light. It would certainly be much more visible than a traditional notification LED. That's nice and all, but it's much larger than I imagined it would be. It breaks up the design of the phone in a not entirely pleasing fashion.
The rumor is that Smart Glow will be featured on the Galaxy S8, so Samsung might be looking to test the feature first with the entry-level Galaxy J2. That phone should be announced for the Indian market in a week or two.