Based on this Facebook post Zeiss will be announcing two new lenses during the IBS show in Amsterdam:
"There’s only a few days left until the IBC in Amsterdam (6-11 September 2012). Who of you will be there and drop by our booth G64 in hall 11? You are invited to test various Carl Zeiss lenses. We have also some news for you! Take a guess."
The speculations are for a new 24-70 zoom lens and probably another Compact Prime wide angle lens.
Check this link for all previous Zeiss announcements.
