The picture posted 20 days ago is said to be of Galaxy S5 camera.
One single picture on what seemed to be a test Flipboard account gained quite some popularity in the last couple of days. The picture had been posted almost 20 days ago but as more viewers realized what was hidden in the text, it started gaining popularity which is not entirely attributed to the content of the picture but rather the EXIF data. It has been stated that the camera behind the shot was a Samsung SM-G900V and the G900 part has been known through a couple of benchmarks; one of them being the AnTuTu.
The app team behind this has been doing quite some research and they have finally claimed that the G900 belongs to the upcoming S5. This is a 16MP camera with a resolution of 5,312 x 2,988 and this is certainly ahead of the 13 MP camera currently featured on the S4.
Moreover, the camera comes with an f/2.2 aperture and a focal length of 4.6mm and all this information comes from the EXIF data. Some assumptions have been arrived at through the aspect ratio of the photo which turns out to be 16:9. This shows that the full resolution of the sensor will most probably be 21MP.