‘The Bills will sport a new-look defense in 2012, thanks to a promoted coach and a high-profile free agent signing. Dave Wannstedt was promoted from linebackers coach to defensive coordinator in January and the team said it will switch from a 3-4 scheme to a 4-3 defense in 2012. Manning one of the defensive end positions will be former Houston Texan Mario Williams, who reportedly signed a 6-year deal that could be worth more than $100 million with incentives. Buffalo Hall of Fame quarterback Jim Kelly played a big part in the recruitment of the former No. 1 overall pick, who is expected to help shore up a defense that gave up 27.1 points per game last season, third-worst in the NFL. As they head into the 2012 NFL Draft, most pundits expect the Bills to go after help at offensive tackle after losing starting left tackle Demetrius Bell to the Eagles via free agency.’