What I also like is the fact that the "map" is bigger, it gives you more freedom to move around and explore and more options on how to eliminate the enemy (example with stealth or with guns a blazing). looks like a GREAT game !
The Graphics and Gameplay is the obvious answer but this is also pretty cool:
Unified Community: The idea of delivering our DLC this way was greatly influenced by the goal of having a unified community. Maps and modes will be available to everyone on the same day. This will ensure that all players are kept together and experience new content at the same time.
Uncharted has always reigned in story so I would love to see the finale of this epic adventure and a feature I am excited to see is the choice in the path taken as there isnt only one fixed path but many each having its own risks and rewards. For multiplayer I am glad that they are bringing in things from the old uncharted to make it a well rounded uncharted (s)mashup! yeehaw!