Well, it does mean the stock is depleted; the available facts are stubbornly silent on whether it will be replaced or when the N810W will arrive. It seems unlikely that the N810W displaces the N810 completely, but I suppose it's possible.

(This is Nokia, not Apple, so I don't think we need to worry about clearing stock to make way for any devices that aren't even announced yet; Nokia seems to announce first, and ship later... But in the end, you never know, so feel free to get excited.)