Must confess I don't know re ETFs but someone else will advise.
On the basis of your Link, and you being in Australia for only 1 month so far in 2015, I think you would be considered as Irish tax-resident for this year, and Australian tax resident next year. Someone else can correct me here, but I think there is a clause in Irish domestic legislation that once someone leaves with the intention of not returning within a shortish period then they give up Irish tax residency ... !? Admittedly I'm shaky on this but I recall Irish Revenue granting refunds of PAYE suffered in the YTD.