Carmel O'Shannessy has just lodged her doctoral thesis Language contact and children's bilingual acquisition: learning a mixed language and Warlpiri in northern Australia in the Sydney eScholarship Repository (D-Space) at the University of Sydney. It's on the emergence of a new language, Light Warlpiri, in the multilingual community of Lajamanu in northern Australia, and on how children acquire this language as well as one of the source languages, classical Warlpiri. It's the first time anyone's looked carefully at mixed languages in Aboriginal Australia, let alone documented the acquisition and development of such a language. A major theme is how children differentiate between the input languages. She's got some very interesting results on how adults and children distribute ergative marking differently in the two languages, but show similar word order patterns in both. The correlation between ergative marking and word order patterns is stronger among children - and Carmel suggests the children are leading language change here.
Go click! It's a ripper!