https://twitter.com/Xbox/status/409880085378768897
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Regarding the PS4 version [PS Blog]:
We had a core team here at Crystal collaborating with the super talented teams at United Front Games (who worked with Square Enix on Sleeping Dogs) and Nixxes (whom Crystal has partnered with since the Legacy of Kain days). Together, we pulled the game apart and painstakingly rebuilt it with enhanced visual fidelity, realism, and a new immersive richness to the world.
Getting our gameplay up to native 1080p meant increasing all of our texture resolutions by over 4x so the details and nuances can be seen in their full glory. However, it’s subtleties like our subsurface scattering technology — how we manage realistic lighting effects through solid/semi-solid matter — that we’re so proud of, which bring a new glow to Lara’s skin. All of these elements working in conjunction drive a much more realistic world than we’ve ever had.