Here are full leaked features and specs of EOS R3 (Amazon/B&H/Adorama) and RF 16mm f/2.8 STM Lens (Amazon/B&H/Adorama) & RF 100-400mm f/5.6-8 IS USM Lens (Amazon/B&H/Adorama) leaked by Nokishita:
https://drive.google.com/file/d/1jTgFe4xy9eRW53M727fsSgw0VibjNbrG/view