http://www.techradar.com/news/nokia-9-may-have-a-dual-lens-camera-with-optical-zoom

HMD Global – the company behind the recent Nokia phones – may have inadvertently given away one of the features of its upcoming Nokia 9 flagship, as an update to the camera app included in the Android Oreo beta for the Nokia 5 highlights some modes that none of the company’s current phones are capable of.

Specifically, there’s mention of both a 2x telephoto zoom and a wide-angle option, either of which would typically require two lenses on the phone.