They replaced David Harris with Demario Davis, Calvin Pryor with Jamal Adams (Rook), and Darelle Revis with Morris Claiborne. In the other Safety spot they're probably starting another rook in Marcus Maye. I like Adams a lot, but depending on rookies to contribute is always a ?.
DL: L. Williams, S. McClendon, M. Wilkerson, S. Richardson
LB: D. Lee, D. Davis, J Jenkins, B. Carter
S: J. Adams, M. Maye
CB: M. Claiborne, B. Skrine, M. Williams
I don't know, maybe I'm underestimating them, but that doesn't look like a 'good' Defense on paper.
2016 Ranks for Reference:
11th in Yards
28th in Points
21st in DVOA