DICE released a very in-depth list of all the new changes for all the classes in Battlefield 4. In a blog post on their official page, DICE discusses all the class changes along with this new field upgrade we've been hearing about for a few months.

Below are just some of the changes for each kit:

For example, this time around the Engineer has a lot more variation in anti-vehicle weapons. We’ve also revamped the way we do vehicle disables and guided weapon systems to give the Engineer a broader set of tactics at his disposal. This includes everything from high damage weapons that may be more challenging to use (like RPG-7V2) to fire-and-forget smart weapons with low damage (like the MBT LAW), and the fan favorite Wire Guided Engineer Missile (the FGM-172 SRAW) that you might recognize from Battlefield 2.

The Support kit has a few more offensive options,  and thanks to community feedback will retain his C4 and Claymores from Battlefield 3. The XM25 gives him some nice indirect suppressive fire, a redesigned remote mortar allows him to use indirect fire from a distance, and the ability to equip carbines and DMRs gives him an added versatility in combat roles.

Recon has gotten a much needed boost to mobility, as well as the return of the Spec Ops play style from Battlefield 2. Pack a carbine, C4 (or Claymores), and Motion Sensors and you’re good to go behind enemy lines. Fans of more traditional sniping roles will enjoy our revamped sniping mechanics with rebalanced Sniper Rifles, the ability to zero your sights (set an aiming distance), and additional optics and accessories. Finally, the Recon players can still utilize the MAV, T-UGS, and Radio Beacon to help out their team.

Assault is still the frontline run-and-gun kit that also serves the role of combat medic. This was one of the major changes in Battlefield 3 compared to Battlefield 2, and one that players have really appreciated. Assault is still the go-to kit with med kits and defibrillators but has picked up some additional mobility with the First Aid Pack, which heals a single soldier over time, or the 40mm Flash Bang rounds to help clear rooms.

Another focus has been the improvement and usefulness of suppressing fire for support classes. Anyone who's every used a LMG from previous Battlefield games will appreciate that.

Field Upgrades are something new entirely though. The way it works is that you can pick a path of upgrades when you select your class. Things like healing, repairing and anything else to help your squad will unlock your upgrades. This will force players to work together within their squad and cut down on lone wolves. The better your squad does the quicker you upgrade. If you squad consisting is getting wiped out, you'll lose some progress to your bad-assery.

Battlefield has always had a "if it ain't broke, don't fix it" mentality, so its neat to see them experiment a bit.

For a detailed list of all the upgrades check out the blog.