well i hope the "Son of Collins"(royalty to AGRA) is up to task if Indonesia gets its way and buy 12 subs.
http://www.defenseindustrydaily.com/indonesia-considers-buying-up-to-12-submarines-01819/
A 3rd would increase the capabilities, and if the Govt. had of gone for the Mistral then this would have been demanded, not requested.
The question is, if the 3rd had of been ordered already, would the work have been made here in Aus. to build at least 2 of the 3 instead of the fitouts?
The possibility of a 3rd would have everyone looking at the word "carrier" (hey, we started already) so even talk of this is premature until the F-35B is flying, then the rumours can get kicked started. So we have 2 paths to along, either a 3rd LHD for the Amphib Assault force, or a Overwatch Carrier to provide support, which would require 2-3 ships in the same Area, and put a hole in the 2 at sea, 1 in dock plan. Do we want to go as far as Fantasy and say 4 if ones a Carrier?
Also with The Ro-ro, would we be looking at something like the USN TAK-E or something a little smaller?