Hi Brendan,
In a nut shell - nothing definite.
I made a submission to the Inter-Departmental Group on property tax on 21/02/2012 and it was acknowledged by e-mail within 24 hours. I think the closing date for submissions was 16 March 2012.
It appears your name may be listed in the appendix to the report as having made a submission and also as their guidelines stated the submission may be published on the Departments web site. As of this afternoon, they don't know for definite that they will be made public and for this reason they can't give a date.
The report is to be given to Minister Hogan at the end of April. Even at this stage the details may not be published as it is only a report to the minister. From then on then the process will be subject to the Ministers decision based on the recommendations of the Inter-Departmental group.