Patrick Murphy-Racey just gave us this sneak peak about the new Sony FE 400mm f/2.8 G-Master.
The only info we got from our sources is this:
1) Autofocus:
The Sony will focus “way faster” than the Canon 400mm and Nikon 400m lens. The reason is the new hardware tech used by the lens (new actuators and servo).
2) Lighter:
The new 400mm GM lens will be also lighter than the Canon/Nikon competition
Still no word on the possible pricing yet but the lens will be announced this summer and be available in September according to BHphoto.