It has been confirmed that the Call of Duty: Ghosts will run at 720p on Xbox One and at a 'full-HD' 1080p on PS4.
So confirmed Infinity Ward boss Mark Rubin today, following recent rumours that the Xbox version would be subject to a disadvantage in resolution next to the PS4.
"For Xbox One we're 1080p upscaled from 720p," confirmed Rubin, meaning the
game will be output at 1080p (1920 x 1080) thanks to upscaling software, but is running natively at 720p (1280 x 720) at the rendering level.
"We're native 1080p on PS4," he went on to confirm. "We optimized each console to hit 60 FPS and the game looks great on both."
Native resolution is technically superior to upscaling, with the latter typically used as a method of improving performance - i.e. to increase (or stabilise) frame rates by decreasing rendering load spent on resolution.