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This year, Call of Duty will return with its ninth installment with Black Ops 2. As expected it will be following Treyarchs previous game Black Ops. Its release date is set for the 6th of November.
Game Modes

Escort
Will be a new game mode
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.
Drop Zone and Kill Confirmed will return
Team Defender and Infected will not return

Pointstreaks

Will follow from Modern Warfare 3s system
Larger emphasis on objectives
A bomb plant is worth 2 points
A neutral flag is worth 1, however an enemy flag is worth 2
A flag assist capture is worth 1, a capture is worth 2
The Specialist Pointstreak has be modified
2 kills now gets you 1 perk
The 4th kill gets you 2 more perks
The 6th kill gets you 3 more perks
The 8th Kill gets you 4 more perks
You do not get every perk when you reach 8 kills
Perks only become Pro when you have them Pro
RC will not return
Heat vision
Is a new Pointstreak reward
When you get the required points, you can activate this Pointstreak and your player pulls out a scope and attaches it to your weapon.
This scopes main advantage is its ability to detect enemies through most walls.
Note, the scope can only be attached to primaries not including shotguns
Item Packages
Requires 5 points
Fall along side care packages and air drop traps.
Features a list of package items only
Including ammo, mini gun, grenade launcher, rocket launcher, and body armor

Prestiges

There will be 15 prestiges
There will be 50 ranks
Every two prestiges there is a 5 rank increase
The final prestige has 90 levels

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

Removed

No MOAB or Nuke
No last stand
No death streaks
No flame thrower attachment

Map Design

Map design and size will be following Black Ops not Modern Warfare 3

Sniper Rifles

Improved sniper rifle usage.
No aim assist for any sniper rifle.
Less sway

Customization

No longer just perk 1 chooses the players appearance
Appearance is a combination of all perks and type of Pointstreak being used.

Hardcore

Larger emphasis on hardcore than ever before
No grenade launchers
Only vehicle guided rocket launchers permitted
Respawn timings decreased (for most modes)
1 bullet in the foot will no longer kill a person, a head or chest shot is usually required.
A person will now bleed out if severely injured.

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

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