NikonUSA have officially discontinued the SB-800 and cancelled all dealer backorders. This basically confirms the rumor when Best Buy decided to liquidate their inventory.
Note that the SB-900 doesn't do film TTL or D-TTL, thus Nikon effectively dropped a product providing primary support for those technologies without announcement. While we could all guess that such an event might be coming, I think Nikon should have made a statement prior to the SB-800 discontinuation that said something like "in the future we will discontinue products that support D-TTL and continue to introduce new ones that don't support D-TTL. Thus, anyone relying upon D-TTL should make sure that they have obtained the equipment they'll need." That's especially true because Nikon is known for its backwards support, and this is one of those few times when Nikon has decided to drop backwards compatibility. To do so without comment means that we now have to wonder what other technologies Nikon will stop supporting in the future without warning.
Also note that the Nikon Web sites don't always immediately drop a product when it is discontinued in shipments to dealers. I'm sure that's coming, but as I write this the SB-800 still appears on the NikonUSA Web site.