The more I look at them, the more I think they have been showing off the PC version up until Janurary. We have seen is confirmation from a Namco PR rep that all of that demo/trailer footage shown with the different lighting is from the PC version.
The writer does concede that it was an off-hand conversation, so don't take it as gospel
http://www.neogaf.com/forum/showpost.php?p=103960797&postcount=520
The previous demos/trailers being the PC version is literally the only plausible explanation at this point. Namco shows off a demo and trailer with specular highlights, high-res textures, normal mapping, silky frame rate (60FPS in the trailer), awesome lighting, darkness mechanic, and the console version ships with literally none of those graphical features
and frame rate issues.
"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."