In addition to my initial report from October, I received new tips form several other countries that the Nikon SB-900 speedlight ($479) is no longer available for sale to dealers. Some countries have not received shipments for a while and do not expect any new SB-900 units any time soon.
A new Nikon SB-910 flash has been on my list of products expected to be announced together with the Nikon D800. I will not be surprised if the new speedlight will include some kind of video LED lighting, similar to the Polaroid PL160DN that was announced at the PDN show last month (see coverage here and here). There are also several old flash related Nikon patents listed in this post.