According to Brian McIntyre of Yahoo Sports:
Crosby had been scheduled to earn $2.4 million in base salary during the 2013 season. Under the restructured contract, Crosby will earn $800,000 in base salary, which will be fully guaranteed if he's on the team's roster on Saturday, Sept. 7. Crosby can make up the $1.6 million difference via roster bonuses throughout the season and through performance incentives.
Obviously this was a response to Crosby's miserable 2012 season in which he made an NFL-low 63.6 percent of his field goal attempts.
The final two years of Crosby's contract were not changed, per McIntyre. Crosby's base salary in 2014 is $2.65 million with a cap figure of $3.4 million. In 2015, those figures are $2.8 million in base salary and a $3.55 million cap hit, as indicated by Spotrac.com.
The thinking within the Packers organization could be that they'll be happy to pay Crosby his previously agreed upon salaries in 2014 and 2015 if he proves himself in 2013, and there will now be plenty of financial incentive for him to do so.
News of Crosby's restructured contract also makes it all but guaranteed he'll be the Packers' kicker when the regular season opens Week 1 against the San Francisco 49ers, all but nixing the chance that they bring back Giorgio Tavecchio or sign any other kicker.
Of course, if Crosby falls on his face during the regular season, the Packers may be back to Square 1, but they'll have to cross that bridge if and when it comes to that.