Images of a Samsung Galaxy A90 case have surfaced and they show both sides of the phone. There's a triple camera on the back, 48MP+12MP+5MP according to rumors and it will have "Tilt OIS" (note that another version of the phone is expected to have 48MP+8MP+5MP cameras instead). This old rumor claimed that the Galaxy A90 camera will not be a slider like the Galaxy A80. And indeed, the back looks normal. However, the phone was reported to have an Infinity-U display, meaning a notch for the selfie camera, which isn't what we're seeing in the image. Samsung Galaxy A90 case...
Source: https://www.gsmarena.com/samsung_galaxy_a90_case_shows_triple_camera_on_the_back_fullscreen_design_on_the_front-news-38053.php