yeah the line is still Pats -3 and I have not seen a line in a SB game at 3 in years. Money is coming on the Giants too which is amazing if you think about it. They were like the third seed or maybe the fourth and the Pats were obviously the first in the AFC -normally a first seed playing a 3rd seed or lower would be at least a 4-6 point favorite, so clearly the perception is that the Giants have a really strong chance at the upset.
The Pats beat the Broncos who barely made it in and then had to rely on an easy missed FG by the Ravens to win at home.
The Giants crushed the Falcons, pretty much controlled the Packers in Lambeau and only had one close game on the road against a very tough SF team so my guess too is that people think the Giants have proven their worthiness whereas the Pats are still kind of a question mark. Be careful though, Brady in a super bowl , in spite of what happened a few years ago, is not someone I like to bet against unless I am getting at least a TD.