Pauline Hanson's One Nation was the prototype of the right wing populist party. Be it concerns about foreigners, protectionist trade stances, opposition to Islam, buying into UN conspiracy theories, denial of climate change, they were there first. This time around Pauline Hanson herself is running for the senate in Queensland, and with the double dissolution, this looks like her best chance in a while to get back into parliament.
There doesn't appear to be any changes in policy since last election.
Finally, they don't seem to have quite understood the new senate voting rules, and are giving incorrect information on their how to vote page. They have mistaken the section that says what a voter should do when voting (subsections 239(1-3) of the Commonwealth Electoral Act) with the section that says if you don't stuff up voting too badly we'll still count it as much as we can (subsections 268A and 269(1)). This seems like the sort of mistake a political party shouldn't be making.