It was interesting to me that in the first two playoff games, the Packers were slight underdogs (two points in each game, I think), yet most of the pundits picked them to win both of those games, and they did. I don't quite know what to make of that.
This week they are the Vegas favorite, but I wouldn't be surprised if a lot of people take the Bears and the points, causing the line to narrow during the course of the week.