https://www.pcgamer.com/ubisoft-details-assassins-creed-3-remaster-improvements/

If you purchased the Assassin's Creed: Odyssey Gold edition, or purchased the game's season pass, you'll get access to a new remaster of Assassin's Creed 3 this March. First released in 2012, the original game is clearly ageing, so it's nice to see it getting some spit and polish.

According to an FAQ on the Ubisoft website, the remaster will boast higher resolution textures, new character models, a new Physically Based Rendering system for lighting, as well as denser crowds, environments and VFX. On top of all that, you'll be able to upscale the game to 4K and HDR.