as you can see freeze will get fix and sec updates and No new features...that's the point..
Yep. Let's have a look at AFP and SMB services OMV provides for example.
SMB is provided by Debian's Samba packages (so all security fixes come from upstream Debian team/repo) while AFP is OMV (so once Ralph provides a Netatalk security fix, Volker will update the openmediavault-netatalk package). I don't see the point once upstream Debian Jessie support stops and therefore many of essential packages don't receive any more updates to further provide support for OMV's 'own' packages since at least I would consider such a situation simply highly confusing. But maybe that's just me.
But that's why I would consider upstream Debian release life cycles currently somewhat related to OMV release lifecycle policy (especially since votdev obviously got tired answering the same questions over and over again -- same with 'When is OMV $n+1 ready' )