The long and the short of it is that the Xbox One version is still rendering at 720p and the PlayStation 4 version is still rendering at 900p. Nothing different from what Battlefield 4 was doing with the Frostbite Engine when we saw it released alongside the next-gen consoles.
While we know that this is still a beta, we have to wonder how much additional time is left really to optimize Hardline prior to actual release? If we had to guess there is now much to do and the majority of the time left isn't going to the improvement of the graphics. Still we expected that Frostbite 3 would be better optimized by now on the consoles.
We also have to wonder on the Xbox One side if they are taking advantage of the most recent optimizations that have been made which have gone on to improve other. Although I have enjoyed playing Hardline, I can't say that I am pleased with graphics that have not evolved much from the release of the console.