THIS IS A LAUNCH GAME, Dice were probably only given the go-ahead/dev kits to ship on Next gen consoles within the last 12 months.
The team are shipping across 5 platforms at Launch, they cannot spend the time optimising specific to platforms when the platform holders are still fixing/sorting there API's.
I am sure out of the box the PS4 version can run at a higher framerate at a given higher resolution but with all the Numpty's on here and other sites simply lying about there PC versions running a CONSTANT 60fps with no drops at 1080p is simply disingenuous, so they aim to hit a Constant 60fps with no drops no matter what and this takes a hit at this early stage, they cannot spend the time optimising one to run a 900p @ 60fps and the other @720p 60fps, most likely they are working on their own solutions (Outside of MS updates) to get to this level of 720/60 and the PS4 version is already there. 90% of the buying public will not care/notice about 720 upscalled to 1080 on both so why waste resource effort on it. Maybe they can patch/update post launch, but IMOP Dice are working to get the game solid and stable (most likely on the X1 at the moment).
I am sure when it comes out everyone will love it/play it and agree the 60fps was the right choice and then just quieten down, or go and attack the next sub-par game!!!
When did gamers all become such spoilt brats!!