Here is a little of the preview.
Xboxyde Ghost Recon 360 preview link.
Of course such a great lighting required a great shadowing system too. And in this too GRAW does not disappoint, as every shadow in the game is completely realtime. No more bad joining between the different type of shadows from static and dynamic objects, now everything is treated the same way, allowing for big objects like trees to sway with the wind while having their shadow moving along. It's quite impressive once in a helicopter to see these hundreds buildings casting these convincing shadows. A developer told me that the shadows alone used more than 30 MB of RAM. Yes, that's half of the memory of a good old Xbox...
Xboxyde Ghost Recon 360 preview link.