Michał Iwanicki, a dev at Naughty Dog (https://plus.google.com/112711369234452959763/about, https://www.facebook.com/people/Micha%C5%82-Iwanicki/660548669) reveals some info on how they used the "old" technique of ligthmaps with new stuff to make the game look beautiful also because of lighting.
The content is rather technical but interesting, nonetheless.
Have fun reading it.