Evolve on PS4 runs at 1080p, Xbox One runs at 900p says DF Tech Analysis. However, PS4 version of Evolve suffers from poor quality filtering and slightly slower streaming. PC version offers the best possible experience. Its PC>PS4>Xbox One.
Evolve Day One patch on PS4, Xbox One and PC will be around 3GB, and Turtle Rock Studios via their official website has listed out changes it will feature: "Improves Loading Time, Fixes Bugs/Glitches from Alpha and Beta" testing and more.