At the very least, there's a next gen Aston Martin Vantage GT3 debuting in 2024 which should be part of the 2024 season:
Aston Martin has announced plans to build an all-new GT3 car, based on its successful Vantage platform, which is set to compete in Fanatec GT Europe from 2024.
www.gt-world-challenge-europe.com
Other than that, there don't seem to be any new vehicles coming to GTWC (at least not on the site yet), so the new Mustang and Corvette GT3 cars are likely to be solely entering Le Mans next year?
2024 season Entry Lists
www.gt-world-challenge-europe.com
Then we have the GT World Challenge 2024 calendar:
The full season calendar for the Fanatec GT World Challenge Europe Powered by AWS with race information, gallery, videos, highlights and results. Everything you need to follow the action.
www.gt-world-challenge-europe.com
This now includes Jeddah, in addition to Hockenheim and Magny Cours which were not added in previous seasons. Assuming there are licensing issues going on for those two, we might get Jeddah perhaps?