According to a patent recently received by Sony, it looks like a button plug-in attached to the back of the PlayStation 5 controller DualSense.
Sony’s next-generation console made its debut a few months ago. Although we cannot fully see the technology of the device in terms of games, we have seen and familiar with the technology of its controller DualSense. It seems that there will be another innovation to the PS5 controller, which comes out with more innovations than the Xbox controller.
According to the latest patent that Sony has received, an accessory add-on comes to the back of the PlayStation 5 controller DualSense. Delivering the necessary documents in June 2020, Sony seems to have received the patent. According to this patent, the PlayStation 5 controller gets two more keys thanks to an accessory added to the back of the DualSense. You can assign these keys as you wish.
As you can see in the image above, it is attached to the controller right under the controller and two buttons are added to the back. It is estimated that the large round part in the middle of the keys will also be a digital display and show which keys have been assigned.
A similar accessory has been seen on the Xbox controller before. It is not officially known when or whether PlayStation will release this accessory.