Ubisoft has revealed that they are going for parity across the Xbox One and PlayStation 4 for Assassin's Creed Unity. That means that due to the limitations on one platform, both of them are locked to a 900p resolution and 30 frames per second.

Senior Producer on the game, Vincent Pontbriand, actually confirmed that the company is going for parity between the platforms for all the wrong reasons.
"We decided to lock them at the same specs to avoid all the debates and stuff.

"Technically we're CPU-bound. The GPUs are really powerful, obviously the graphics look pretty good, but it's the CPU [that] has to process the AI, the number of NPCs we have on screen, all these systems running in parallel.

"We were quickly bottlenecked by that and it was a bit frustrating, because we thought that this was going to be a tenfold improvement over everything AI-wise, and we realised it was going to be pretty hard. It's not the number of polygons that affect the framerate. We could be running at 100fps if it was just graphics, but because of AI, we're still limited to 30 frames per second."

The bolded emphasis in the above statement is from us. This push for parity has naturally pissed off many people. 1080p was eventually patched in to the PlayStation 4 version of Assassin's Creed 4: Black Flag, though there is no indication that this will be the case for Unity.

(via Videogamer)