Naughty Dog has explained lot of factors related Uncharted: The Lost Legacy in a recent Q&A. The game will support Dynamic 4K resolution and HDR on PS4 Pro, DLC will have it's own Menu, and many other things.
GameInformer latest issue carries new information on Uncharted 4: The Lost Legacy. The lead protagonist Chloe hires Nadine for a specific reason. Asev is the lead villain, and the battle is for the Tusk of Ganesha.