Assassin's Creed Unity, mods and modern PCs fix almost all the issues the game had on launch. The remaining problem is the render distance still being a lot shorter than a modern PC can manage.
I've played mostly 5+ year old games on pc in the last few years. Mostly because single player AAA games outside of playstation first party are essentially hardly made nowadays. So as a way to revive them for myself I decided to look through games released from around 2007 - 2016 that are on PC where they can all be ran at high resolution and high FPS nowadays. Sites like pcgamingwiki having all kinds of info how to modernise some of these pc ports that are lacking helps a huge amount. FOV, framerate unlockers, higher render distance, textures resolution, higher quality aa just to name some.
Assassin's Creed Unity and Batman Arkham Knight, both early last gen games have aged amazingly well.
I agree with the other comments here. My own morals prevent me from being excited for this. I felt so betrayed by the main games release that I genuinely cannot convince myself I'm okay with paying for this. It looks great and I hope it is great and the beginning of a new start for them as a studio.
I've found a lot of comfort recently in just accepting that it's okay to be playing a few of the gamers in my backlog at one time. Before I used to think growing my "currently playing" list too large was a mistake because I'd become overwhelmed or something. Now I've embrased just enjoying playing whatever I feel like in the moment.