I swear, Samaritan has completely poisoned the discussion of next generation consoles.
1) *none* of the next gen consoles will have the computational power required to render it
2) "bu-bu-bu it can be optimized for one GTX 580, they said!" equates to the downscaling of resolution, textures, light sources, etc. not to mention a GTX 580 is too hot and power hungry still for a console and its 22nm counterparts aren't going to help you here. Whatever is going into a 2012 console is not going to be a 2013 part.
3) Samaritan was a cutscene. There was no "game code" in it. By design, more of its i7+3 tri-SLI GTX 580s could be used to shiny it up
4) The cost to create a game that looks like that the whole way through for is not feasible, even if we had $799 consoles with the required minimum hardware for it
The end. Stop looking at it.