Offensive line coach Larry Zierlein and special teams coordinator Bob Ligashesky are gone.
Quarterbacks coach Ken Anderson has retired.
Offensive coordinator Bruce Arians is staying, apparently at the behest of quarterback Ben Roethlisberger.
What does it mean?
For one, it means that head coach Mike Tomlin was very serious when he said he's out to change the fact that Roethlisberger has been the most sacked quarterback in the league over the past four seasons.
Was that all Zierlein's fault? Nope. Roethlisberger was sacked 40-plus times in 2006 when Russ Grimm was still the offensive line coach in Pittsburgh and Ken Whisenhunt was the offensive coordinator.
But the team learned to live with Roethlisberger taking some of those sacks by holding the ball because him holding the ball also turned into some big plays for the offense.
While Arians will be back, some of the things the team does offensively will change. He and whoever the new QB coach is will work with Roethlisberger on getting rid of the ball more quickly - ie. reading defenses better - with the idea that they can prolong his career.
Roethlisberger has bucked that in the past because the coaching staff has been willing to live with the bad plays because the big plays were so great. But with the team's third-down conversion rate plunging this season to the bottom of the league and a defense that wasn't as dominant, the Steelers couldn't fight through the bad sacks this season. They just couldn't afford to lose that kind of field position.
Roethlisberger going to bat for Arians and getting his way is a bad sign for this team, however, in that it gives the QB the idea that he's in charge of this ship.
Should Roethlisberger have some say in the matter? Sure. But Tomlin had better have told him that if Arians stays, Roethlisberger had better spend the necessary time in the offseason working on getting rid of the ball more quickly.