for that first pic....
if i'm not mistaken, those auto-feeding CD slots always need SOME space on the sides. the discs should be the same size, it's just the bay that makes it look bigger. if they want backwards compatability with BD-ROM and DVD, they wouldn't go changing the size.
and i think the USB comparison pic is the most acuracte out of them all. you can tell how relatively big it is just from the pic of the pres. holding it up. the PC Power connection looks accurate, and so does all the other plugs. i think that first pic is very distorted, and that they didn't take the pictures to the same scale.