It's not CGI, you can tell by the look of hairs, fidelity of skin on Moss's face or his teeth, cloth folds, facial animations, ect. Montage at the end looks like it is from some kind of demo (look at the textures when the heroine is holding to the table). It's just very well crafted with really good post-process.
The question is - is the cinematics in the game will look this good (because it was made for trailer/demo and not for the game itself)? Gameplay will have some form of simplification (not the same post-process, LOD's, mesh culling) that's for sure.