New Assassin’s Creed Unity Patch is 6.7 GB

After a minor one day delay Ubisoft has released the new patch for Assassin's Creed Unity on Xbox One and PS4 with the PC release later this week. "Patch 4" is focused on fixing performance issues and some gameplay elements.
Ubisoft released the patch notes for the large update which aims to improve the frame rate of the game and fix some issues players are having with broken saves and crashing. The patch notes are fairly long and it seems to be a rather large amount of tweaks an improvements.
Here is the full patch notes list:

Stability, Performance and Save Game

• Fixed numerous random crashes both on Campaign and Coop
• Implemented multiple optimizations and fixes to improve overall performance
• Fixed save issue caused by the companion app on the main menu (loss of data)
• Fixed save issue caused by contacts list (crash occurring). Users should now have access to save

Gameplay (navigation, fight, stealth)

• Fixed various navigation issues
• Fixed issues with lock picking chests
• Fixed additional haystack issues

Character, AI and Crowd

• Fixed various character, crowd station and NPC issues

Online, Matchmaking, Connectivity and Replication

• Fixed various matchmaking and connection issues both in matches and when starting a match.
• Fixed various issues with voice chat
• Fixed join-in-progress issues
• Fixed various replication issues between host and clients
• Fixed issues with player rank and COOP/heist rewards
• Fixed issues with Helix credits
• Fixed issues with the My Club feature

Menus and HUD

• Fixed HUD icon issues and issues with map information
• Fixed various Initiates issues
• Fixed additional issues with notifications

Mission tweaks (campaign, coop and side content)

• Fixed various low occurrence walkthrough breaks in both Campaign and COOP
• Fixed various NPC issues
• Fixed issue with the quest log disappearing for specific side missions

World and 3D

• Fixed various collision and mesh issues
• Fixed additional issues where player would fall through the world
• Fixed specific areas where textures were missing

PC-Specific 

• Fixed crash on "Quit to Windows" in free roam mode
• Fixed crash on accepting multiple "Join the club" requests
• Fixed issues with TXAA
• Fixed issues with PCSS
• Fixed issues with textures on NPCs
• Fixed black texture issues on MSAA-4x, MSAA-8x and TXAA
• Right Control now can be assigned as a hotkey
• Minor UI fixes

Ubisoft has had a rough launch for Assassin's Creed Unity. From lukewarm reviews to huge graphical bugs and more, the launch of Assassin's Creed Unity has been anything but smooth. In fact people have had so many issues with Unity that as a way to make up for the issues Ubisoft is giving the first DLC away for free to all players. Those who bought a season pass can get a free game from a list that includes FarCry 4. 
Ubisoft has apologized for the issues and they say they are continuing to work on improving Assassin's Creed Unity.