First this is all the information i know about it and i may update it once in a while so..here we go!!
"Singapore" (Strike Mission)
"Protect P.O.T.U.S (Regular Mission)
Treyarch has been working on their own anti-cheat tool
Zombie mode will be built around the multiplayer engine
CoD: Elite will be fully integrated in the game
Combat Training will return
Will likely utilize a modified version of the Black Ops engine
4vs4 mode - Teams fight against each other, in addition to zombie hordes
8 player Co-op, competitive play.
Built aroound the multiplayer engine
(New) New Game modes:
Similar to Search and Destroy however a live player must be escorted to one of three areas (or two depending on the map) without being killed.
The match will have rounds, consisting of one life only.
(New) ELITE 2.0:
ELITE is being fully incorporated into Black Ops 2
Combat record has been modified and re-named as ELITE Stats
There will be a specific lobby for clan matches (new way of leveling clans)
Clan Tournaments can now be implemented
(New) Combat Training:
Will be returning with vast improvements.
Difficulty is no longer based on how long the bots take to start shooting.
Bots now have an advance AI system
Similar to the behavior seen in the MW3 Spec Ops survival
(New) Perk System 2.0
The Perk Pro system has been upgraded
There is now 2 options a perk can advance to.
Both require different challenges to unlock
Once the desired Pro version is unlocked, the player can select that as their “Perk Pro”.
Once selected, the only way to choose the other option is by entering prestige mode.
For example Perk slot 1 has the perk called Speed
Speed – Reduces the time taken to aim down the sight
Pro I – Swaps weapons faster
Pro II – Throws equipment faster
in Black Ops 2 will be built around a 10 point allocation system.
Every player is granted 10 allocation points, and each item is worth a set, depending on their usefulness. A primary weapon would possibly be worth from 3-5 allocation points, while a perk could be worth 1-2 points. You get to pick what you want on like the secondary you can take it off and get more perks or whatever you want.
(Update) Submachine Guns:
Winchester Model 1887
Light Machine Guns: