Back in 2012 Zeiss promised at least one new “special surprise“ fast ZM lens (for Leica M mount) for 2013 that never materialized, unless I am missing something (see full press release). Maybe they will come around to release this special new lens during the 2014 Photokina show – they already have a new teaser going on.
Zeiss discontinued their Ikon rangefinder camera back in 2012 (both black and silver versions) – not sure if that has impacted their future ZM plans.
See the updated Photokina 2014 rumors/rumors/expectations roundup.