Ofcourse it's more massive than Watchdogs... Killzone is exclusive (and full supported) for PS4.Wii U will have problems not with the games they showed... but with the games they will come in the proccess... I am not sure if wii U can run kilzone though.. at this scale.. it can but I believe in a lower scale (fps, textures) It was really good and massive, more massive than watchdogs.
Watchdogs on this presentation was played on a PC with almost the same specs, but It's also confirmed to be released for Xbox360/PS3 and Wii U.