Oh god, does that mean new templates for everything?!
It'll be a whole new bus, most parts will be recreated from scratch, there's a choice few parts that might be worth saving and correcting. This means that it's not a case of which textures will change, but if any will remain the same at all. So yeah, expect all your repaints and mods to break.The changes to then will be due to model changes, and possibly underlying texture/UV changes.