The Watch_Dogs presentation was a nothingness, even with the cameras turned off. It was mostly a demo that had apparently leaked onto the net from an prior presentation, with some changes. They didn't really talk about any new gameplay features, and from the sound of things didn't show any either. Didn't discuss the tech at all.
Batman: Arkham Origins looked really nice to me. Obviously very similar to Arkham City in gameplay and structure, but the graphics looked really impressive, especially all the snow and the soft shadows. Arkam City was a looker, but also had a ton of neon ligthing. This seemed to have a lot less.
Assassin's Creed IV: Black Flag was mostly just tech talk. The comparison slides were between current gen and next gen. They made a big point of that much of the tech used in the PC build will also be on Xbox One and PlayStation 4, because they want the game to be able to visually compete with other next gen games. It looks really nice and certainly a leap over the standard, current gen build. The PC improvements were smaller things like nicer shadows and the HBAO+, but they do look good, and they showed comparison slides between the "next gen" builds and the PC maxed out build. I'm not sure how much of the early, internal tech video will make it into the game, but the faces looked VERY impressive when in contact with rain.
