With the new DC set, what changes should we expect from Fewell?

Firstly we should expect to see a Cover 2, that is what he used in both Buffalo and Chicago.

Ironically I think Fewell has the best stable of DEs he has ever had.

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some general info on the cover 2 from wikipedia:

Cover 2
In traditional Cover 2 schemes the free safety (FS) and strong safety (SS) have deep coverage responsibilities, each guarding half of the field. The Kansas City Chiefs, Tampa Bay Buccaneers, Minnesota Vikings, Chicago Bears, and Detroit Lions all run or have run a variant of this defense called the Tampa 2. In the Tampa 2 defense, a third player (usually a linebacker) plays a middle zone, guarding an area closer to the line of scrimmage than the safeties but farther out from typical "underneath" pass coverages.

Cover 2 can be run from any seven-man defensive front such as the 3-4 and the 4-3 defenses. Various kinds of "underneath" coverages played by cornerbacks and linebackers may also be implemented. For example, "Cover 2 Man" means the two safeties have deep coverage responsibility while the cornerbacks and linebackers follow their offensive assignment in one-on-one coverage. The San Diego Chargers inherited a base Cover 2 Man 3-4 from former coach Wade Phillips. Cover 2 can also be paired with underneath zone schemes: "Cover 2 Zone" refers to two safeties with deep coverage responsibility, but now the cornerbacks and linebackers drop into specific coverage zones where they defend passes only in their assigned area.

In cover 2 the cornerbacks are considered to be "hard" corners, meaning that they have increased run stopping responsibilities and generally defend against shorter passes, although if two receivers run a deep route on a certain side of the field, that side's corner has deep coverage responsibility as well. It also relies heavily on the "Mike" (Middle) linebacker's ability to quickly drop deep downfield into pass coverage when he reads pass.

A variant of cover two is the Inverted Cover 2, in which either right before or after the snap the corners "bail" out while the safeties come up - in effect switching responsibilities. This strategy may be employed to trick a quarterback who has not correctly interpreted the shift.

Advantages
The advantage of cover 2 is that it provides great versatility to the defense as the corners can play run, short pass, and deep pass with the confidence that they have support from two deep safeties.

Disadvantages
The main weakness of the Cover 2 shell occurs in the middle of the field between the safeties. At the snap of the ball, many times the safeties will move toward the sidelines in order to cover any long passes to quick wide receivers. This movement creates a natural hole between the safeties that can be attacked. By sending a receiver (usually a tight end) into the hole, the offense forces the safety to make a decision: play the vulnerable hole in the middle of the field or help out on the wide receiver. The quarterback reads the safety's decision and decides on the best matchup (i.e. which mismatch is better: tight end vs. safety or wide receiver vs. cornerback).

Another disadvantage of cover 2 is that it leaves only seven men in the "box" (the area near the ball at the snap) to defend against the run. In contrast cover 1 and cover 3 usually leave eight men in the box.

The Giants already use a version of the cover 2, so we already have alot of the pieces in place.

The interesting thing will be whether we use a Tampa 2 with a LB, most likely Michael Boley dropping into the middle zone.

Two things are certain.

1. The defensive line will be shaken up, particularly at DT

2. We need a MLB with decent coverage skills, Pierce is almost certainly gone.

3. The secomdary, particularly safety will be upgraded.


What we can expect:

1. A dominant secondary

2. More defensive takeaways, particularly interceptions

3. A much better scoring defense

4. The defensive line to rebound back into one of the NFL's best

5. Improved play from our LBs