There's a new issue of Zeiss Camera Lens News out this morning. And Zeiss has now announced the ZE 28mm ƒ/2 Distagon for Canon EOS cameras. The U.S. distributor also says that the previously announced 18mm ƒ/3.5 ZE and 21mm ƒ/2.8 ZE will begin shipping along with the 28mm ƒ/2 ZE on the 20th of this month.
My advice regarding the 28mm? Unless you just have to have that focal length, hold out for the 35mm ƒ/2, which should be coming along in due course. The 28mm is a good lens, but the 35mm makes my short list of true standouts.