Trailer here: https://www.youtube.com/watch?v=R_Ob-fupzKg

Projected release date: January 2021

And this news is only 6 days old! (yeah, I just bumped into it)

Still no hitman and hitman 2 (new version) here on gog

Unlikely as they are "live service" titles.

I hope they come here at some point in time, DRM-Free and all.

Those two games are awesome.
I have those currently on Steam.

Hitman III will be published by IOI. I don't know what their contract is with their previous publishers, but I'm hopeful the games will eventually find themselves here on GOG, or at least Hitman III.

Maybe we'll see a Hitman Complete with all 3 modern titles.

https://www.ioi.dk/announcing-hitman-3/

I think that's the intention with this last title. They're doing what they did with 2 and the previous game and allowing for content imports if you owned them.

Which gives a bit more foundation about reports going back to 2015/16 claiming that this essentially was a hacked up full Hitman game. Maybe that's somewhat true, maybe it's partly false, but with their intention for 3 to be a hub for the other two titles' content it seems at least plausible.