The WT CJ4 is eventually going to replace the default CJ4 in the sim, so it will definitely be on Xbox as well.
The WT team is small though. They can only really focus on 1 major project at a time. Right now, that’s the G1000 NXi and according to Matt, there’s already been a few thosands hours that have gone into it. And there’s still a long way to go to get it where they want it to be. The other mods are currently on the back burner in maintenance mode (they’ll issue fixes and small updates if required if a sim patch breaks them) while they focus on what Microsoft is currently paying them to do.