Stuff is jam-packed full of credible information [/joke]
It's the exact same article from the AFR. TPG are running out of telcos to buy in Australia. It wouldn't surprise me at all if they bought Vodafone (AU and/or NZ).
IMHO Vodafone would never just sell one or the other as it would leave them with a single interest. If they wanted to sell, they'd want to get rid of both.