The new Sony A7R IV and the super-telephoto Sony FE 600mm f/4 GM OSS lens are in stock and now shipping from retailers.
Recall that the A7R IV is a 61MP full-frame mirrorless camera with an impressive feature set. Check it out here at B&H Photo.
Additionally, the Sony FE 600mm f/4 GM OSS lens was announced back in June and is available now. Check it out here at B&H Photo.