Latest information on CASA giant 40nm 5,000 foot CTAFs

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In this thread: Who at Airservices was responsible for undermining the Government NAS decision? I asked the questions:

So what is the ‘Multicom’ to be used for, precisely?

What broadcasts, precisely, should be made on ‘Multicom’, by whom and when, precisely, that are not part of a CTAF procedure?

De_flieger’s answer was:

aircraft operating below say 5000 ft that may need to communicate or coordinate with other aircraft in the area, not specifically associated with a CTAF. Examples include but are not limited to aircraft operating from unmarked airstrips, survey aircraft operating at lower levels, search and rescue or firefighting aircraft - any of these may be in conflict with other VFR aircraft operating OCTA. Broadcasts - those necessary to coordinate with other aircraft or avoid collisions.