Assassins Creed 3 will be launching on October 30th for North America on Xbox 360 & PlayStation 3.
Assassins Creed 3 will be launching on October 31st for Europe on Xbox 360 & PlatStation 3.

Assassins Creed 3 will be launching on November 20th for North America on Microsoft Windows.
Assassins Creed 3 will be launching on November 23rd for Europe on Microsoft Windows.

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Set in Colonial America, the Assassin-Templar war has become involved in the American Revolution. As series' protagonist Desmond Miles, the player controls a young half-English, half-Native American man named Connor Kenway, drawn into the fight against tyranny when his home is attacked by colonists. Over the course of the game, Kenway will encounter historical figures including George Washington, Benjamin Franklin, Thomas Jefferson, Charles Lee, Israel Putnam, Paul Revere, General Lafayette, John Pitcairn, William Prescott, King George III, Samuel Adams and Friedrich Wilhelm von Steuben. The story will span 30 years of Connor's life, from 1753 to 1783. Boston and New York will be cities that can be explored, as well as the American Colonial Frontier, spanning forest, cliffs, rivers, Connor's Mohawk village, and the settlements of Lexington and Concord. It will be open for the player to take part in hunting activities, and approximately one third of the story will take place in the Frontier. The entire Eastern seaboard will also be explorable via Connor captaining a ship.

Source: Wikipedia. [/b]

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This is my personal synopsis.
From what I have seen via E3 game-play and teasers is that the game will feature a much more fluid evasion system for combat and a much better combat AI in general. One video even shows Connor executing a Enemy from a moving hay-bale.

Assassins Creed 3 will be the feature product of "AnvilNEXT" the new engine Ubisoft has developed for Assassins Creed III.

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This may not be all, these are what we have seen so far.

Bow and Arrow:

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Connor is seen wielding a bow and arrow, which will presumably come in handy during the in-game hunting. The bow will also be Connor's preferred long-range weapon.

Rope Dart:

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This grappling hook-like implement can harpoon and drag enemies into treetops. With the Rope Dart, Connor uses the victim's weight to safely slide down from relatively high up. This uses ammo, and is not reusable.

Tomahawk:

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Connor carry's a tomahawk with the blade itself forming the iconic Assassin's Creed Crest and can be dual wielded with his detachable hidden blade.


Hidden Blade:

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The Hidden Blade is now detatchable and can be used as a small knife.

Pistol:
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The pistol will have ability to dual wield pistols. These appear to be one shot kills on low-level enemies (wolves, Regulars).

Musket:

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Both British and Colonial soldiers arm themselves with muskets, These take very long to reload, and Connor will be using them mostly as melee weapons.

Sawtooth Sword:

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The Sawtooth Sword is unlockable as one of Gamestop's Pre Order Bonuses.

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The multiplayer of AC3 seems to have been completely upgraded from AC:R, they have made the multiplayer have more characters than in the past and atleast one new multiplayer mode similar to Call of Duty's Domination mode.

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That is right, Assassins Creed is going Co-op, sort of. In Assassins Creed 3 we will still see the same multiplayer we have grown to love (or hate) but we will also see something new, a 4-player cooperative mode where the team of 4 has to execute 4 enemies in a stylish manner.

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Boston Demo Walkthrough:

Wolf-Pack Coop mode:

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