Found this doing my morning catch-up of AndroidPolice. This is the H791 model and as such has band 28 for those on the Telstra and Optus networks. The only downside is the 16gb internal storage with no SD expansion. This is definitely a dealbreaker for me personally but for kids/parents this might be OK.
Available in Black and White, no Mint.
More info on the phone and reviews here:
http://www.gsmarena.com/lg_nexus_5x-7556.php
Personally I would pay $10 more to get it sooner and pay in AUD not USD.