EH, come on.
Contrast is cranked up higher, and that's literally it.
There's absolutely no difference in lighting *quality*.
And yeah, there's like 4 particles missing.
Seriously, there's no downgrade to speak of at this point, besides the game is still one year from release. Who knows what it will look like by then (for better or worse).
Currently, it's one of the very few games i'm genuinely excited about, and i don't even own an xboxone anymore. 2015 does look like the year i'm jumping back in though.