We are still working on it, there are no issues or problem but, after getting some users feedback about priorities, we decided to give priority to other features that has deemed more important to the core functionality of the product (opposite to visible passengers, which is purely visual), like the Pushback Pull feature that has been requested for years, and it's finally coming very soon.
That doesn't' mean visible passengers won't arrive or have problems or issues, nothing like that, they'll just be delayed a bit, to prioritize core functions like pushback, refueling and deicing, which will all be updated significantly in the next weeks.