dpreview forum that the new Zeiss lens for Sony E-mount will be a Sonnar 24mm f/1.8, it does look big. Filter thread is 49mm. The expected MSRP is $999, announcement should be on August 24th.
If anybody has the block diagram to share, please send it to firstname.lastname@example.org, we are interested in knowing the element arrangement and the true design of this Sonnar.
Link: dpreview forum discussion