Nikon Japan issues an official apology on their website for not being able to keep up with the demand for the Coolpix P900 camera that has been out of stock for months. Nikon promised to speed-up the production, but did not give a specific availability date.
UPDATE: the Nikon P900 camera is currently in stock at BestBuy.
You can see the 83x zoom capabilities (2000mm) of the Nikon Coolpix P900 camera in this post.