A Best Buy employee took a snapshot of promotional art for Assassin’s Creed 3 and it features an assassin in front of the original Continental flag. This appears to prove that the game will indeed take place during the American Revolution.
From the weapons and ornaments, he appears to be a Native American. The tomahawk in his right hand uses the assassin’s symbol as the blade. Two images was sent to Kotaku, the other image shows that Ubisoft will be unveiling the game on March 5.