I must admit to being puzzled by the new nav rollout, or lack of. I've had it since June/early July and it is indeed much better at routing. As good as Waze from most accounts that I read. You need the new maps before the nav will arrive, the maps showing the water as grey is the tell tale sign. Often new maps will download in the background and you don't always get a notification that they've arrived, it's not like a software update that you instigate. I've had a further map update since then as well.
Anecdotally maps only download over wifi, but I know of owners whose cars don't ever sit on wifi and it hasn't stopped them getting new maps.
However, I don't have V9 yet!