We knew that the highly anticipated Sony FE 35mm f/1.4 GM Lens was production delayed, with Sony indicating that the estimated ship date was "To be determined."
"To be determined" is obviously vague, and our expectations have since been guided by the estimated ship date provided by retailers. B&H originally moved the expected ship date from Mon, Feb 22nd to Mon, Apr 12, and now lists the more vague "End of Apr 2021" as the expected availability for this lens.
Amazon USA and Adorama are not guessing.