My guess is they'd go for something like a preferential ballot or instant runoff as opposed to the more dramatic changes of Single Transferable Vote or Mixed Member Proportional. That'd allow the will of voters to be expressed a little more than the current system without dooming the country to eternal minority governments.
And more cynically, it'd probably suit the Liberals quite well given how they were clearly the 2nd choice for a lot of voters who voted for other parties based on the polls.
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