According to CathNews the Pope made the announcement after accepting the resignation of Msgr Harry Entwistle, who has served as leader of the Personal Ordinariate of Our Lady of the Southern Cross since it was established in 2012.
The Personal Ordinariates, of which Our Lady of the Southern Cross was the third in the world, were established to provide a way for groups of Anglicans to be received into full communion with the Catholic Church – as Catholics – while retaining distinctive elements of their theological, spiritual and liturgical patrimony.
http://mnnews.today/church/2019/40204-pope-appoints-canadian-new-head-of-personal-ordinariate-in-australia/
http://mnnews.today/church/2019/40204-pope-appoints-canadian-new-head-of-personal-ordinariate-in-australia/