A listing made for Assassin's Creed: Unity on Sony Entertainment Network (since removed but seen by Gaming Bolt) has suggested a possible resolution of 720p on PlayStation 4. In an earlier interview (also with Gaming Bolt), Ubisoft confirmed that they were targeting 1080p and 60fps on both new-gen platforms, and therefore there's every chance that the listing was a simple mistake. If it is an error, expect Ubisoft to correct it early next week.