The following information, claiming to reveal the game's release date and a load of multiplayer features, was first posted on the official Black Ops forums in a thread that was later taken down, and its cached version is unavailable. It was then reposted in another thread on Activision's forums, which was also killed off by the publisher, but its cache remains available (via MP1st).
None of this information is confirmed, but there's no reason it couldn't be genuine as it all sounds feasible. Here's the lot:

Leaked Black Ops 2 Multiplayer Information

This year, Call of Duty will return with it's ninth installment with Black Ops 2. As expected it will be following Treyarch's previous game Black Ops. It's release date is set for the 6th of November.
Game Modes
Escort, 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 3's 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
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 XD 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 it's 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 Ops survival
Activision Publishing CEO Eric Hirshberg has said of this year's Call of Duty: "This year we expect to further expand our presence with the launch of an all-new epic first-person shooter title under the Call of Duty brand. From what we've seen to date, the game already looks fantastic and will bring meaningful innovations to the franchise."

If you're interested in what's next for the Call of Duty series, you might want to check out the Future of Call of Duty feature we published on the site yesterday