I received a tip from a new source that Nikon is working on a new FTZ2 adapter (replacement for the current FTZ version). The reason I post this rumor online is because I think this is very plausible – since Nikon is still lacking some lenses in their Z lineup, they will want to make sure that every F-mount lens works as good as possible with the current Z cameras and especially tele-lenses on the upcoming Z9 camera.