Those details can't be locked into the constitution - if they were we'd need a fresh referendum every time a minor detail needs to be changed.

Publicised details that haven't been worked out yet would allow the fear campaign to focus on Labor proposing changes to the constitution that don't line up with what they've said, which would be a disaster for the Yes vote. I think Labor knows what they're doing. Winning the referendum was never going to be a sure thing.

Also - if the referendum doesn't pass it will tarnish the LNP. Younger Australians, a demographic where 85% of people are in favour of The Voice, will stop thinking of LNP as "conservative" and instead think of them as "racist". The LNP might never recover from that. The cynic in me wonders of Labor deliberately brought this referendum upon us a little too early. If it fails, they can just repeat it in a few years when there will be more support (if only because a higher percentage of voters will from the generation of Aussies that clearly support The Voice)