Final update without new video engine? Broken promise? Steinberg statement from Oct 2016:
This will enable us to provide the new video engine still in Q1 2017, which would be in accordance with the current schedule. Consequently, the engine will be available for future releases of Cubase/Nuendo and in cost-free maintenance updates for current Cubase Pro 8.5.x/Nuendo 7.0.x versions.
Quicktime was outdated, abandoned and insecure for more than 6 months of the sales period of 8.5. So you promised to bring an update for this version to remove this dependency.