Assassin's Creed Unity is an upcoming Sandbox action-adventure game developed by Ubisoft Montreal, releasing on Xbox One, Playstation 4 and PC on October 28, 2014 in North America and Europe. It is the sequel to Assassin's Creed IV: Black Flag. The game follows the assassin Arno Dorian during the French Revolution as he goes on a mission of redemption for the death of his adoptive father and to seek out the real powers behind the revolution.
The game is primarily developed by Ubisoft Montreal but does so in conjunction with nine other studios worldwide based in Kiev, Singapore, Shanghai, Annecy, Montpellier, Bucharest, Quebec and Chengdu. The creative director for the game is Alexandre Amancio who also worked on Assassin's Creed: Revelations, the story that brought Assassin Ezio Auditore's story to an end. After that game had shipped he was exhausted and took a job in marketing, but returned in 2012 for the development of Unity.
Amancio, on returning to the company, wanted to make a compelling and engaging love story, without it becoming a secondary story line, using next-generation technology to push the boundaries of story-telling. Ico and Passage has been cited as games that placed specific emphasis on romance in their stories, but noted that they were both less complex than an Assassin's Creed game.
The lead writer is Travis Stout of Fallout: New Vegas fame. Ceri Young also helped write some of the story missions for Unity focusing in the co-operative missions, with Russell Lees writing the story side-missions in the game. Any historical characters that appear during the time period in which Unity is set have been relegated to side-missions only in order for the team to concentrate on telling the story of Arno.
The game is designed with an upgraded Anvil engine which is used alongside the Theatre Zen and City Light tools, which improves animation, asset management and volumetric lighting. With this engine, Unity is capable of creating crowds that number the thousands, with new animations and behaviors such as, holding hands and chatting to each other, all to enhance their believability. When Arno is looking at a crowd from a distance, their animations are simplified, but the closer he gets the more "bones" the characters develop, and the more complex their animation becomes.
Amancio commented on the use of English actors in the game with identifiable English accents, which differs from their choices in previous games to try and align accents of the characters with geography. It's clear to players that the game takes place in France so French accents were deemed unnecessary.
Three composes have orchestrated the soundtrack for this game; Ryan Amon, Sarah Schachner and Chris Tilton.
 Locations and Exploration
The game will be coming exclusively to next-generation consoles and PC with a fully explorable city of Paris built to a 1:1 scale with crowds numbering the thousands. The entire city will be available to players, including building interiors and catacombs which will be loaded seamlessly without the need of loading screens. Landmarks such as Notre-Dame will also be open to Arno, with a quarter of its interior explorable. Empty rooms may have unlockable treasure. Map icons will also be visible from the rooftops.
The haystacks from previous Assassin's Creed games have by and large been removed in favour of player controlled descent from buildings and other high spots. Social Stealth has also gained a crouch option activated by a button prompt. Combat has also been improved to feel more realistic, one such change to the system is the removal of a counter kill option
Approach to missions has also received an overhaul from previous games in the series. Memories will be dealt with an Adaptive Mission Mechanic as opposed to a series of objectives, thus giving players several potential paths to take, all which ultimately lead to the completion of the mission. One such example is the option to follow a target and should they detect you a chase sequence will begin as opposed to desynchronization and restarting from the last checkpoint
Each memory is dealt with in a similar style to that of the first Assassin's Creed game, in that each mission is boxed off, referred to as "black box missions." In the opening cinematic of the each mission, clues will be shown revealing multiple possible paths in which the mission can be completed. Rather than following a linear path there can be up to 10 different approaches to an objective. In order for each memory to be completed, Arno must leave the area of the mission - this differs from previous Assassin's Creed games where the assassination of the target was considered the end of a mission with the protagonist often having to make a hasty exit afterward. In Unity, depending on the path chosen, Arno can enter and leave a mission with the only person knowing of his presence being his target.
The weapons and appearance of the Assassin's in Unity can be customised, and experience gathered during missions can be used to enhance four attributes: Melee, Health, Ranged, and Stealth. For example, Arno has the ability Eagle Pulse which can be used to detect how many guards are in a given room, this, like any other ability in the game, can be upgraded with the experience gained during missions. A disguise skill can also be unlocked to escape pursuing guards. All skills and upgrades will be available for players to unlock on Arno's mission to become a Master Assassin.
In total there are estimated 200 choices that can effect player gameplay:
- Hoods can increase the radius of Eagle Sense while also decreasing the reaction time of guards.
- Assassin's Robes can increase the time spent blending in the crowd, and the time it takes for guards to recognise you.
- Arm items can change the appearance of the Hidden Blade, increase melee damage from the Phantom Blade, and the time it can take to revive allies.
- Belts and sashes increase the amount of health Arno has and the items he can carry.
- Trousers and boots can decrease the damage Arno takes from falling from a great height and the sound of running noises, as well as increase health.
 Modern Day
A modern day portion of the game is different from that of Assassin's Creed IV: Black Flag in that it won't feature the player as an employee of Abstero Entertainment. It will instead, similar to Black Flag have the protagonist as the player -- you -- but instead they will be approached by the assassin's to explore Arno's memories as well as help them fight the modern day templars.
 Co-operative play
Following on from Wolfpack gameplay featured in the multiplayer portion of Assassin's Creed III and Assassin's Creed IV: Black Flag, Unity will be the first game in the series to introduce a co-operative element to the campaign of Assassin's Creed. A total of 3 additional players will be able to join another persons game to take on story missions. Amancio has stated he expects a lot of players to make full use of this feature.
Each of the Assassin's is fully customizable and the experience gained from participating in the mission can be invested in combat, navigation or stealth abilities.