The Playstation 4 Pro comes with enhanced hardware that will allow for 4K support. Will this mean that all games that have been released for he PS4 so far will get a visual upgrade when they run on the PS4 pro?
While it is true that the hardware in the PS4 Pro is far more powerful than the original PS4, there may not be any difference in most of the games. Games will need to have support added specifically to support the hardware in the PS4 pro. This means existing games will need to be patched in order to support the new hardware.
Even though patches will be required to fully take advantage of the new hardware, we should see load speed increases and frame rate increases for most games now that the hardware can load the existing games faster, but in terms of sharper textures and smoother models, the game will need to be patched in order to add these kinds of performance improvements.