From my understanding, they intend to add what is essentially a new wing of government who are to be able to vote (perhaps even veto?) on "certain issues", ostensibly those that pertain to the aboriginal people and their culture. It is also my understanding that we have no other concrete details about the actual implementation other than the fact that "The Voice" is to be comprised entirely of people with aboriginal and Torres Strait islander heritage. The reason we do not have any other concrete details is because our wonderful government in all their wisdom has yet to pen the actual legislative documents necessary to outline and define the powers that will be given to "The Voice". Indeed, it seems they intend to delay the actual writing until after they've secured their "Yes" vote. They are essentially all but asking for a blank cheque from the bank of executive power here.

So the number of things that could go wrong are innumerable. Western Australia has recently implemented and repealed very similar laws, though they were only state-wide, that essentially made it illegal to dig on your own property (for putting fences in, for example) without express permission from an aboriginal consultant, services that could cost upwards of $350 an hour. At best this is just going to be a nation-wide repeat of this disastrous policy, only we're going to have an impossible fight to win to undo the damage our government will have wrought.