The Hidden Secrets pack was just released for all players who hold an Assassins Creed Season Pass on the Xbox 360, PC and Playstation 3. For those of us who don't own a Season Pass, The Hidden Secrets Pack will be available to download on December 13th.
The Hidden Secrets Pack adds three new missions which were available as pre-order bonuses in the U.S. The three missions are titled Lost Mayan Ruins, Ghost of War, and A Dangerous Secret. All three missions amount to around one extra hour of gameplay. In addition to the extra missions, the Hidden Secrets Pack also comes with two costumes for Connor, The colonial Assassins and Captain of the Aquila. It also brings in two multiplayer characters, The Redcoat and the Sharpshooter.
The Hidden Secrets pack also brought news about some upcoming expansions, like the Tyranny of George Washington, which will be implemented in three episodic content packs and the Battle Hardened Pack which will revolve mostly around the multiplayer.