Assassin's Creed website reveals that the fourth patch for Assassin's Creed Unity is now rolling out for consoles, saying the patch for the PC edition of the stealth/action sequel will arrive later this week. They also offer patch notes which include some PC specific changes:

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