Samsung's revised Galaxy A lineup was a key growth driver for the company throughout 2019 and it looks like the same will apply to next year. A new leak gives us an early look at the back frame of the Galaxy A51 which reveals an L-shaped setup for the cameras. According to previous speculation, the back will house a quad camera setup. Some early rumors suggest a 48MP main shooter alongside a 12MP ultrawide lens, 12MP telephoto shooter and a 5MP depth sensor. The same leak also shows that the Galaxy A51 will come with a 3.5mm headphone jack, dual SIM slot and a USB Type-C connector....
Source: https://www.gsmarena.com/samsung_galaxy_a51_to_feature_lshaped_quadcamera_setup-news-39941.php