BUFFALO BILLS (6-10)
New faces: WRs rookie Sammy Watkins and Mike Williams, LBs Brandon Spikes and Keith Rivers, DB Corey Graham, RB Bryce Brown, defensive coordinator Jim Schwartz, DL coach Pepper Johnson.
Key losses: LB Kiko Alonso, S Jairus Byrd, WR Stevie Johnson, defensive coordinator Mike Pettine, Hall of Fame owner Ralph Wilson.
Strengths: DL, RB, WR.
Weaknesses: QB, OL, S.
What's new: Defense switching to more conventional 4-3 scheme under Schwartz, former Lions coach who took over after Pettine left to become Browns head coach. Though Bills set franchise record with 57 sacks last season, they struggled stopping run by allowing 150-plus yards rushing seven times. Schwartz's defenses have solid track record against run, and addition of Spikes in middle should help plug holes.
Expectations: Bills hope to end NFL's longest current non-play drought of 14 seasons, but have plenty of work just to get out of AFC East cellar.
MIAMI DOLPHINS (8-8)
New faces: LT Branden Albert, DT Earl Mitchell, S Louis Delmas, RB Knowshon Moreno, OG Shelley Smith, CB Cortland Finnegan.
Key losses: DT Paul Soliai, OT Richie Incognito, CB Nolan Carroll, OL John Jerry, S Chris Clemons.
Strengths: DL, WR, CB.
Weaknesses: LB, OL.
What's new: Dolphins more than just tweaked offensive and defensive schemes in offseason. Offensive coordinator Bill Lazor is implementing plenty of motion into attack, all designed to bring out strengths of QB Ryan Tannehill.
Expectations: Bullying scandal that overshadowed last season is over, which means locker room should be better place. What happens on field, that's still in doubt. Miami has made one playoff trip in last 12 years, and hasn't won playoff game since 2000. If Lazor's offense clicks quickly, that could change, though loss of DE Dion Jordan (suspended) for first four games could impair defense.
NEW ENGLAND PATRIOTS (13-5)
New faces: CB Darrelle Revis, CB Brandon Browner, WR Brandon LaFell, LB James Anderson, rookie DL Dominique Easley.
Key losses: CB Aqib Talib, RB LeGarrette Blount, S Steve Gregory, LB Brandon Spikes.
Strengths: QB, CB, LB, TE.
Weaknesses: OL, S.
What's new: Patriots have great depth at cornerback with addition of Revis and Browner. At safety, they must replace Gregory, who was not re-signed and retired. Veteran offensive line could change with impressive youngsters Jordan Devey and Bryan Stork. LaFell should help receiving corps.
Expectations: Patriots remain class of AFC East after reaching conference championship game. Defense is upgraded with Revis and Browner and with LB Jerod Mayo and DTs Vince Wilfork returning from injuries that sidelined them most of last season. Tom Brady-led offense would get big boost if TE Rob Gronkowski returns to form after knee surgery in January.
NEW YORK JETS (8-8)
New faces: WR Eric Decker, RB Chris Johnson, QB Michael Vick, RT Breno Giacomini, CB Dimitri Patterson, LB Jason Babin, rookie S Calvin Pryor, rookie TE Jace Amaro, ST coordinator Thomas McGaughey.
Key losses: QB Mark Sanchez, CB Antonio Cromartie, WR Santonio Holmes, RT Austin Howard, TE Kellen Winslow Jr., S Ed Reed, WR-KR Josh Cribbs, ST coordinator Ben Kotwica.
Strengths: DL, ILB, RB, K.
Weaknesses: CB, QB, WR.
What's new: Jets trying to get Smith to be more comfortable using legs on plays to make things happen when options fail downfield. Smith doesn't have Vick's speed or elusiveness, but actually led Jets with six TDs rushing last season. OC Marty Mornhinweg could implement more read-option or wildcat plays with Smith and occasionally Vick.
Expectations: A lot will hinge on whether Smith can make significant leap organization is hoping for, or Rex Ryan could be looking for new job and Jets searching for next QB. Smith was solid in training camp while being given every opportunity to succeed and will be counted on to reverse dismal numbers -- 12 TDs, 21 INTS -- from rookie year. Additions of Decker and Johnson give Smith viable playmakers, something Jets might need if they get into scoring slugfests as opponents exploit shaky secondary.