DE Brett Keisel waiting on Steelers?

Pittsburgh Steelers veteran defensive end Brett Keisel has spent his entire 12-year career in Pittsburgh and has been a starter on the line since 2007. At 35, Keisel's on the older end of the NFL spectrum but it's not out of the question he has a year or two left of serviceable play. What's the word on Keisel's status going forward in Pittsburgh?