I don't have any release dates or finalized specs available.
There will be an intermediate UN55B8500 coming in the near future, and then the UNxxB9000 series likely after that. At this point, it's all speculative, but the prototype of the B8500 Series was pretty impressive and I have every reason to believe it will be released soon.
Does anyone know when the new 9000 series will be released? These were supposed to take the place of the A950's.