If you're on console, then it finally does 64 man teams. Otherwise, pretty good level design, levelution, different weapons (2 new weapons to dominate the entire sandbox instead of the M16A3, etc...), tweaks in animations to look nicer, new engine that runs smoother, perks only given if your squad works together, swimming improved (fast swim with sprint, combat while swimming) for naval focus, redesigned loadouts, better stat tracking, entirely different progression system (your rank doesn't influence the guns you unlock), etc... At its core, its a lot like Battlefield 3, with a lot of polishing and small design changes to make the game play smoother. You don't really need to worry about server problems if you play it on PC. And ummm, the most notable weapons in the game are: ACE23, M416, M249, ACE23 CQB, M40A5, AK5C, MTAR-21, MG4, UMP-9, SRR-61. I would just look them up. You can also mix a lot of weapons up. Each class has access to all carbines, DMRs (semi auto snipers), and shotguns as primary weapons. If you decide to get it on PC, shoot me a message if you're looking for someone to communicate with!