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Is the offensive line ready to go?
The Bears added receivers Brandon Marshall and Alshon Jeffery, but I'm not sure Jay Cutler is going to be able to get the ball to them. They'll get tackle Gabe Carimi back from injury, but the offensive line could still be the biggest weakness on the team.
Can the secondary compete with the high-powered NFC offenses?
The Lions added cornerback Dwight Bentley to their porous secondary during the draft, but I'm not sure that will be enough to compete with Green Bay, New York and New Orleans on a consistent basis.
Green Bay Packers
Have the Packers addressed their defensive deficiencies?
2012 draftees Nick Perry, Jerel Worthy and Mike Daniel will all add to the pass rush, but the secondary wasn't up to snuff in 2011 either. Tramon Williams will need to bounce back from a poor season if the Packers want to hold opponents under their 2011 total.
How much will the Vikings miss Adrian Peterson?
Unless Greg Childs and Jairus Wright, two rookie receivers from Arkansas, can step in right away and contribute for Minnesota, the Vikings will still be a running team in 2012. However, if Peterson misses a substantial portion of the season, it remains to be seen if Toby Gerhart can carry the load.