Per Rotoworld.com

The Pittsburgh Post-Gazette expects the Steelers to release LG Willie Colon this offseason.
Although Colon blocked well when he wasn't being penalized in 2012, his season ended on injured reserve with recurring knee injuries and the Post-Gazette calls it Colon's "last straw" as a Steeler. The Steelers are expected to hand left guard to 2012 seventh-round pick Kelvin Beachum. Colon is owed a $5.5 million salary in 2013. His release would save $1.9 million under the cap.