According to a tweet  by Jim Utter, of the Charlotte Observer, Joe Gibbs Racing has released crew chief Greg Zipadelli, who has been crew chief for Joey Logano since 2009. Prior to that, Zipadelli served as crew chief for Tony Stewart, who left the team to start Stewart Haas Racing.
Zippadelli will join SHR as competition director. There was speculation during the season that Zipadelli would join SHR as Stewart’s crew chief , as the two won two Sprint Cup championships together. But, following the firing of Darian Grubb, Stewart chose Steve Addington to sit atop the pit box . Grubb joined JGR as crew chief for Denny Hamlin , with Mike Ford getting released.
JGR confirmed Zipadelli’s release.
No word on who will replace him as crew chief for the No. 20 car.
Update: In another tweet , Utter reported that Jason Ratcliff will serve as crew chief for the No. 20 team. Ratcliff climbed the ranks in the Nationwide Series, working at Sadler Racing and Brewco Motorsports before joining JGR in 2005 as crew chief for JJ Yeley. He then went on to serve as crew chief for Denny Hamlin and Kyle Busch, winning the 2009 Nationwide Series championship with Busch.
Update 2: JGR issued a press release  indicating the moves.