Ubisoft has been springing leaks all over its Assassin's Creed franchise, with various reported problems in Assassin's Creed: Unity, but with Patch 3, the developer has simply watered down the graphics on the PS4 version at least.
The news is coming from Reddit, and EXPreview, where Patch 3 has been pushed out to the PS4 version of the game, watering down the graphics to increase the performance. You can see the differences between the game before the patch was released, and after Patch 3 was deployed. You can see that most of the light is gone, with the texture detail dropping considerably.
I guess that's one way of increasing the performance of your obviously, still very broken (and possibly unfixable) game - disable things. Next stop, buildings?