AMENDMENT (24/01): There appears to be a little bit of confusion of the framerates reported, and the fault is our own and our poor wording. We inaccurately used the term average when the math, in reality, does not add up. Logistically saying the average is ~30fps implies it exceeds and dips below 30fps, averaging at the number. That is not the case. What our sources have reported is that the listed FPS are roughly the most common targets during performance. So while the Xbox One version can reach ~45fps, for a majority of play it will sit around the ~30fps market, give a few frames. Same goes for the PlayStation 4 build, which in most cases hits around 60fps, take a few frames. Our sources have not confirmed exactly, but our own extrapolation of the information suggests you might say the average (accurate use of the term) Xbox One performance could be ~35fps, meanwhile the average PlayStation 4 performance may be ~55fps. Actual, concrete performance benchmarks will need to wait until the game is out for everyone, as we certainly dont have them.
We apologise for any confusion from misuse of the term average, and hope this amendment better clarifies performance on both systems.