they can't release a line of like -7 or something....everyone would take the pats with that short of a line. make it -14 or so, and then you get the betting public taking a hard look at taking the giants.
if the number goes up, then you know what the betting public thinks of the current trend abut the pats not covering. if it goes down, then you can assume everyone has bought in to the Giants and eli not making game changing mistakes.
remember, as VIA is so fond of saying, ti's not meant to predict the margin of victory, it's meant to get people betting on both sides of the line. period. and this line will do that. i'll be surprised if it changes all that much.