So if you've missed it Hollywood has the rights to Gantz and their working on a live action.

Now if you haven't seen the Japanese Live action and you are a Gantz fan, I highly recommend it.

Hollywood is making a live-action Gantz adaptation with, according to Deadline, Julius Avery of Overlord fame helming the project. Had you heard? Because Hiroya Oku, the manga artist who created Gantz, hadn’t.

Also until the rights are returned to it's creator, we will have to wait for any other Anime series or live action of Gantz coming out of Japan.

source; https://www.cbr.com/gantz-creator-no-new-anime-hollywood-rights/

It would be cool to see a video game completely game in the essence of Gantz which doesn't follow usual video game format. Meaning a gameplay build to make you feel you are in the world of Gantz. Something new.

We can only dream for now.
https://www.youtube.com/watch?v=C7vP0cosdOM