FBW is not available on Xbox. I don’t think they’ll leave what’s one of the most popular default planes untouched. Particularly when it comes to the FMS and flight planner based on the old system that’s currently being removed from the sim in favour of WT’s updated architecture.
Now how much the plane as a whole will be changed or improved is anyone’s guess. But I’m fairly confident that the FMS will get redone to bring it up to the current WT systems at the very least.