Their officials were talking about the D850. Findings:
10 fps (without battery pack)
together with fast AF this will be a sports capable camera with 46 Megapixels resolution
(appears to adapt something of the D500 concept for FX)
NOT compatible with MB-D12, there will be a new dedicated battery-pack
They expect the first samples to be available in October
Pricing will be about 1000 Euros above the D810 which will remain available in parallel....