This system is supposed to help women candidates. Why?
Because under the current system, where you only have one vote, Mr Average (Male) Voter may be reluctant to vote for a female candidate. Whereas if he can vote for more than one candidate and there's a woman on the list he is more likely to "risk" giving her one of his votes.
If enough voters behave this way the total number of votes could be enough to get her elected.
To see how this works, click on: Link to document explaining the new system
And if the system does in fact lead to more women getting elected, more of them will take the trouble to stand in the next election, meaning that even more will get elected etc etc
I'm not sure I'm convinced by this argument but would be interested to know what others think.