Appar­ent­ly, Hang­er 13 (the devel­op­ers of Mafia ΙΙΙ) have been real­ly sneaky with their patch­es. In a not so recent update, patch 1.05, the devs released not only cus­tom rides and rac­ing, but a PS4 Pro update that no one noticed.

This patch was added back in Decem­ber and was first noticed a few days ago by Dig­i­tal Foundry, which bumped the res­o­lu­tion on the Pro to 1440p on 4k tele­vi­sions. It added along with it oth­er visu­al improve­ments, like motion blur and improved shadows. 

If you do not have a 4k tele­vi­sion, you will still see some slight improve­ment even with a 1080p tv. Cutscenes will down­grad­ed, because the game will run the launch assets of the PS4. Fram­er­ate should stay at a con­sis­tent 30 frames, but could drop at times but not below 25 FPS, and only dur­ing extreme moments in the game. 

Check out a video below by Dig­i­tal Foundry: