To say it simply: I would be happy if we could install it with a one liner without days of work
For differents reasons (company policy or technical), we have to keep the existing base, and there was an installer built for the iso, some shell script for installing perl module, packages including multiple and different softwares (mc-httpd: apache, mpm-itk, apr, apr-utils, php, openssl, curl and probably one other I forgot recompiled together). So to keep that and progress, we have to analyse existing, redo newer version trying to improve each occurences.
So we will publish an ISO. When ? I don't know. All i know is we are working with KVM and we already created a version (call it alpha) of the VM we deploy each time we use it so KVM Vm will be ready first and VMWare HyperV should follow. After that (or at the same time), we'll publish for our professionnal and probably everyone a migration script to migrate from MC Squeeze to MC Jessie. The iso will need more work as an installer has to be added (to install packages, make partitions, launch shell script for all requirements etc...).
Again, I'm not against an ISO, simply, most people would prefer to deploy a VM in 5 minutes, or install an AWS or Softlayer instance than download and use the ISO. Next step after VM will be iso, and a bonus step will probably a docker container (I had one, but there was garbage on, and i didn't touch it since one year....)