As John says take a look at the SC 600. All these new visa numbers are part of the "streamlining" to make things easier (read: putting several visas together under the same subclass)
Take a at the "tourist" stream - DIAC made changes late last year to consider granting parents longer tourist visas. Parents of Australian citizens or permanent residents can be granted visas of up to 18 months, or 3 or 5 years (depending upon circumstances). These visas will permit a maximum stay of up to 12 months in any 18 month period (please note they come with conditions).