This lens is listed at Bhphoto now.
I got confirmation from a top source that there will be a Sony product announcement tomorrow at 15:00 London time. The source did not tell what’s going to be announced and only said this:
“price and some specs are surprising.”
UPDATE: Two more sources confirmed Sony will have a product announcement.
I am not 100% sure yet but I guess Sony will announce the full specs and pricing of the new Sony 400mm f/2.8 FE lens. I hope that “price is a surprise” means the lens isn’t as expensive as the Canon 400mm and Nikon 400mm versions. And I wonder what the spec “surprise” will be about…
UPDATE_2: Not sure yet if Sony will also announce another new lens…