According Diglloyd (paid subscription site) Zeiss will release a new 25mm f/2 Distagon lens (source):
"A new 25mm f/2 Distagon is coming that will likely behave more like the 21/2.8 Distagon."
Six months ago Sony released the Distagon T* 24mm F/2 ZA SSM lens and the new 25mm f/2 Distagon may have a similar design: