In his review, Chris praised Assassin's Creed Origins' "brilliant" setting and new systems that combine well with the series formula. Naturally, there was room for improvement—which is something today's extensive patch hopes to address.
Due today, update 1.1.0 introduces a new Nightmare difficulty mode and adds a new NPC scaling option that lets enemies scale up to player's levels. Ubisoft qualifies this by saying enemies will only scale up to meet the player's level as they progress, and will not scale down. A new 'Horde' mode has been added to the Arena, while HDR display is now supported for PC players.
Moreover, tweaks have been made to the game's economy, while Trinkets and Animal Goods have now been capped at 999. Stuttering issues have also been remedied on Nvidia graphics cards when playing in borderless mode, which is something a fair number of players have faced before now.
A number of other fixes have been applied to graphics settings, UI, audio, the game's world and quests—not least how NPCs react to your presence.
Again, Assassin's Creed Origins' update 1.1.0 is due later today. Head in this direction for its patch notes in full.