Hello, silver_bullet. Thank you very much for taking the time to reach the Intel Communities Team. I will do my best to assist you further.
Allow me to share with you that there is not an official date for the release of this product that I can share with you right now. When this information is available we will be posting it on the https://newsroom.intel.com/ Intel® Newsroom site or you can contact an Intel® authorized distributor to double any update.
To be honest your response is just hilarious: "allow me to share with you that I have nothing to share" :-)
Anyway I've just checked support page for Hades Canyon NUC and there is freshly release BIOS update.
https://downloadcenter.intel.com/download/27747/NUCs-BIOS-Update-HNKBLi70-86A- Download BIOS Update [HNKBLi70.86A]
In release notes there is mentioned fix for shutting down not always successful.
So Intel is probably updating BIOS in first batch of NUCs before it is shipped to re-sellers/customers.