Looking at the latest screens, you can see what RAD have done with the game. The first shot is from the Sony Gamers Day in May (it's been anti-aliased because I had to resize it down). And the second is from E3. Check them out!
In the bottom shot (the second and most recent), the lighting is much better. There are light shafts in the scene and you can see more damage to the large door in the background. And much better shading all round. Could this latest build of Chains of Olympus be using the full 333Mhz power of the PSP?
It certainly is stunning looking!
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)