In a new Reddit post, Infinity Ward has revealed some of the changes they are bringing to Call of Duty: Infinite Warfare at launch based upon the feedback from the beta.

WEAPONS:

Shotguns:
Increased the consistency of shotgun damage
Shotgun damage at longer range has been increased
Slightly increased the one shot kill range.
Both the Reaver and Banshee have received a slight bonus to their 1 trigger pull kill range
Snipers
Bullet spread at the hip no longer gets smaller as the player ADSs. Once the scope reaches the players eye, the bullet spread goes instantly to zero.
Sniper aim assist was reduced slightly for the KBS Longbow and the other bolt action snipers. Our turn rate while Aimed Down Sights is still slowed to help with precision aiming.
Sniper-class weapons no longer have any Aim Assist until the optic fully reaches the players eye.
For the ELO and Scout optics on snipers, the idle sway while ADS has been increased along with the players view bounce when moving. Because these optics are less zoomed in, the view bounce and the sway are felt less. These changes are to promote more stationary aiming and firing with these optics.
The Tracking Chip optics visuals have been improved
Reduced bonus of the Quickdraw attachment on snipers
Updated snipers to have more flinch when getting shot.
Launchers
The Howitzer Grenade launcher can now be fired from the hip instead of requiring full ADS
SMGs*
The RPR Evo epic variant (Ripper) has had a tuning pass to increase recoil given its bonus fire rate
PERKS & RIG TRAITS:

Marksman We fixed a bug where, in addition to reducing flinch, it was also reducing recoil. This would then stack with Gun Perks and the Foregrip Attachment. This bonus reduction has been removed.
Momentum Fixed issues with speed not being retained
Marked Target The temporary red marker on the victim has been toned down
HEALTH REGEN AND SPAWNING:

Health Regen time has been reduced
Infusion bonus reduced
Continuing to refine spawn system on beta maps, will assess remaining launch maps in live environment
ECONOMY:

Increased salvage gain in mission teams.
Changed currency value in supply drops.
Increased drop rate of keys in round-based modes.
SCORESTREAKS AND RIGS:

AP-3X Increased health, bullet damage, and weapon accuracy up close to help with target acquisition
RC-8 Increased health, increased weapon accuracy to help with target acquisition, slight increase in fire rate, and slight damage increase on splash damage
T.H.O.R
Increased speed of tracking rockets
Increase damage of both tracking and straight fire rockets
Bombardment:
Slight decrease in both time to the initial drop and the time between each subsequent drop
Updated area damage to be consistent inner to outer
Rigs:
Refining payload balance
Slight tweaks to gameplay balance across rigs
MODES:

Defender: When carrying the Drone, the score-per-second bonus has been bumped from 5 score per second to 10 score per second. Scorestreak carrier bonus is unaffected.
Gun Game: Now features all classic weapons. In future updates, weapons with alternate functions will retain their state upon spawn.
Domination: When you step off a flag, the current capture bar progress starts to decay. The rate of this decay has been halved from the Beta. This allows players to hop off a flag to defend it and then get back on the flag with less progress loss
MATCHMAKING:

Potential player evaluation was too strict. We were doing some very thorough testing of your connection to other players before placing you in a lobby with those players. This turned out to be a bit too thorough, and eventually was relaxed, leading to shorter matching times.
Incorrect geographic categorization. There was an issue in our geolocation system which was causing some players to be incorrectly categorized. This was also resolved during the beta, improving matchmaking times.
Dead lobby cleanup. The process which cleans up unused or dead lobby information from our back end was taking too long. This was causing a number of slowdowns when searching for a match.
The matchmaker was always quite good at generating new lobbies, but one thing we noticed was that queueing into a join in progress situation was taking much longer. This was due to some issues in the way we track information about the lobbies that are currently playing a match. These issues were also addressed during the beta, and sped up the join in progress case immensely.
TTK (TIME TO KILL / ENGAGEMENT):

We know a lot of you had different experiences with TTK during the Beta. With the above adjustments to dedicated servers, matchmaking, and weapon tuning, we think youll find that the TTK will be more balanced at launch, both on the attacking and receiving end. Well continue to monitor and balance throughout the year as need and would love your feedback in the process.
Were always looking at TTK and will continue to balance and monitor
DEDICATED SERVERS:

One of the major infrastructure changes we made this project was how dedicated server allocations work. Were using a new load balancing system on the servers themselves, as well as pretty heavily changed how the game chooses a datacenter to use, and requests a dedicated server from that datacenter.
At the start of the Beta, you may have noticed some host migrations and some poorer quality matches. We discovered some issues where the new system was dropping our dedicated server utilization numbers way below target. After some tweaks and fixes we were able dramatically improve our dedicated server utilization for the second weekend and beyond.