Even before the launch of the iPhone 7 Plus, there have been rumors about a dual-camera module coming to the Galaxy S8.
WCCF Tech reported in June 2016 that the Galaxy S8 could be the first phone in Samsung's lineup to have a dual-camera module. A suite of software features was reportedly in the works to make full use of the dual-camera module.
ETNews claimed in October that Samsung was still deciding whether to have an all-in-one dual-camera module or have two separate cameras. It was later revealed that Samsung had filed two trademarks for imaging technologies which could potentially be used for the dual-camera sensor.
Korean media reported in January 2017 that a Galaxy S8 prototype with the dual-camera module had been sent to Samsung's CEO and Vice Chairman. It is said that the dual-camera module will be exclusive for the bigger Galaxy S8 model.
While these reports seem convincing, the leaked image of a purported Galaxy S8 handset and 3D renders suggest that the dual-camera module will not materialize this year. Tipster @evleaks also confirmed that the imaging hardware specs would remain the same as the Galaxy S7. No rear dual-camera module is spotted in the 360-degree video of the Galaxy S8 handsets too.
No dual-camera module is indicated on the leaked specs sheet of the Galaxy S8+; you can expect the same 12-megapixel Dual Pixel camera alongside an upgraded 8-megapixel front-facing camera.
Therefore, we are inclined to believe that Samsung will not include a dual-camera module for the Galaxy S8 in the launch version.