Well we all know they gonna release a next gen remaster with the cut multiplayer as a reason to jump into the PS5 version. Probably holiday 2021. After that, probably a new Ip. They tend to do that (I don’t see them going back to say Jak)
This is the most likely scenario imo.
And for those who think ND will take too much time to announce their new project(s), all we have to do is paying attention to ND strategy in the past two generations: the original UC was released in less than a year after PS3 was launched. UC4 was annonced on the very day PS4 was launched and was released in 2016, about two years after. I expect ND to show their new projects at anytime in 2021, and the release date could be in late 2022.